This Just In

Remember the long, detailed post I wrote the other day about ferns? that went on about taxonomy?  Forget about it.

As reported in Science News, “kingdoms are so 20th century when it comes to the main evolutionary branches of the tree of life.”  It’s an interesting article if you like this sort of thing.

20150724-20150724-_DSC0048

here’s a rosemallow, just because

Fern Morphology and Terminology: an Illustrated Guide

20150711-20150711-_DSC0070
purple-stem cliffbrake (Pellaea atropurpurea) and maidenhair spleenwort (Asplenium trichomanes) growing together from a crevice in a wall

It’s been said that botany is the study of terminology.  Ferns have a language all their own (mostly).  Here’s a little primer on how ferns are structured and described.

A fern consists of a rhizome (a horizontal underground stem), with roots below and fronds above.

The frond is the entire “stem and leaf” arising from the rhizome.20150724-20150724-_DSC0080

 

fertile frond of christmas fern (Polystichum acrostichoides)

 

 

 

The frond consists of a stipe, blade, rachis, and pinnae.

The stipe is the portion of the stem from ground level to the lowest pinna (analogous to the petiole of a flowering plant).20150724-20150724-_DSC0080-3

 

the highlighted portion is the stipe

 

 

 

The blade is the portion of the frond carrying the leafy tissue (analogous to the leaf of a flowering plant).20150724-20150724-_DSC0080-2

 

everything except the stipe is the blade

 

 

 

The rachis is the midrib portion of the stem within the blade, and the pinnae (singular pinna) are the green parts of the frond (analogous to the leaflets of a compound leaf).20150724-20150724-_DSC0080

 

a single pinna highlighted; the pinnae are attached to the rachis

 

 

In twice cut (bipinnate) ferns, the pinnae are further divided into pinnules (sub-leaflets).20150724-20150724-_DSC0089-2

 

a single pinna with pinnules

 

 

 

In thrice cut (tripinnate) ferns, the pinnules are divided into pinnulets (sorry, no pictures!).

There’s terminology for blade shapes, too.  An undivided blade is simple.20150730-20150730-_DSC0350

 

a frond of walking fern (Asplenium rhizophyllum)

 

 

 

A blade with divisions reaching all the way to the rachis is pinnate (once-cut).
20150724-20150724-_DSC0103

 

a blade of maidenhair spleenwort (Asplenium trichomanes)

 

 

 

If each pinna is further divided all the way to the midrib, the blade is bi-pinnate.20150724-20150724-_DSC0086

 

a blade of marginal wood fern (Dryopteris marginalis)

 

 

 

If each pinnule is further divided all the way, the blade is tri-pinnate (again, no picture).

A blade with divisions not reaching all the way to the rachis is pinnatifid:
20150727-20150727-DSC_0021

 

a frond of common polypody (Polypodium virginianum)

 

 

 

These terms can exist in combination.  This broad beech fern (Phegopteris hexagonoptera) is pinnate-pinnatafid according to one authority,20150724-20150724-_DSC0091

but it sure looks bi-pinnatafid to me:20150724-20150724-_DSC0096

 

 

 

 

 

Next time, a look at some fertile fronds.

Variations on a Theme: Monkeyflowers

20150724-20150724-_DSC0038

Mimulus ringens (Allegheny monkeyflower)
and
Mimulus alatus (winged monkeyflower)
Scrophulariaceae

There are about 90 species of monkeyflowers in the US and Canada, but almost all of them are confined to the western part of the continent.  Five are found east of the Missiissippi, and of those, only two are known in Maryland.

Which one is pictured above?  That’s winged monkeyflower, but you can’t quite tell from the picture.  The flowers are almost identical, though in different parts of the country there can be marked color differences.

20150728-20150728-DSC_0199

The Allegheny monkeyflower has sessile leaves (meaning the leaf base touches the stem), while the flowers are connected to the stem by a long pedicel.

 

 

Both species can grow up to 3 feet tall, and both have the same cultural requirements: wet or at least consistently moist soils, and some shade.  The sorry-looking specimen shown here was growing in a very interesting place (perhaps subject of a future blog post), in full sun.  All of the plants (there were only a few) were stunted.

20150724-20150724-_DSC0036

Winged monkeyflower is the opposite of the other with respect to how the leaves and flowers connect to the stem. In this species, the flowers are sessile or almost sessile, while the leaves have longed winged petioles (and winged stems).

The winged monkeyflower has some conservation issues: special concern in Connecticut, threatened in Iowa, endangered in Massachusetts, probably extirpated in Michigan, and rare in New York.

20150724-20150724-_DSC0035nice, tall plants in part shade along the river

 

UPDATE: the genus Mimulus is now placed in the Phrymaceae

Once Turned, Under the Pines

20150726-20150726-_DSC0129

pinesap
aka false beechdrops, yellow bird’s-nest
Monotropa hypopitys
Ericaceae

 

On a recent nice evening I talked Steve into going for a walk with me to look for certain ferns.  He agreed to go when I promised not to take my camera.  This is sort of a left-handed good luck tactic, as I seldom fail to find something interesting when I don’t have my camera handy.

It worked: we found this tiny stand of pinesap on a hillside above the trail.  I took a few crappy iPhone pics, which later served as a guide, since I was able to look at the geotag and find the stand again, this time with camera and tripod but sans Steve.

20150726-20150726-_DSC0127-2

As I wrote about Indian pipe last month, the Monotropas aren’t actually saprophytes; they get nutrients by parastizing certain fungi that form a symbiotic relationship with certain trees.  As such, they have very specific growing requirements, and are somewhat rare within their range.

“Once turned, under the pines” is a literal translation of the botanical name of this plant, which is found throughout the US and Canada except for four states and the extreme north.  While researching I found that ITIS* does not recognize the species name, and instead reverses the genus and specific epithet, calling it Hypopitys monotropa.  This is probably based on genetic studies, as so many recent taxonomic reclassifications are.

Pinesap is endangered in Florida and threatened in Iowa.

20150726-20150726-_DSC0126

*the Integrated Taxonomic Information System, about which I wrote yesterday

 

Ferns and Lycophytes: an Introduction

20150711-20150711-_DSC0030

marginal wood fern
Dryopteris marginalis

 

This summer I took an Audubon Naturalist Society class on ferns and lycophytes.  You’re probably wondering, “what is a lycophyte?”  Hang tight, I’ll get to that.

Apparently I’m not the only wildflower enthusiast to keep a log or life list of finds; turns out I’m also not the only one who includes ferns on that list, though ferns aren’t even flowering plants.

So what does that mean, “ferns aren’t even flowering plants”?

20150527-20150527-_DSC0002

 

that kind of looks like a flower spike, but it isn’t; it’s the fertile (spore-bearing) stalk of a rattlesnake fern, Botrypus virginianus

20150527-20150527-_DSC0004

 

 

 

 

 

If you recall from grade school science, the taxonomic hierarchy starts with the plant and animal kingdoms, then moves down to division (phylum for animals), class, order, family, genus, and finally species.

Flowering plants are in the class Magnoliopsida.  They are vascular (containing tissues that transport fluids and nutrients), and reproduce via seeds.  Ferns are in a different class: Polypodiopsida.  They are also vascular plants, but they reproduce via spores.  Lycophtyes are in a third class, Lycopodiopsida; like ferns, they are vascular and reproduce via spores, but the morphology is different: ferns consist of rhizomes with roots below and fronds above, while lycophytes have stems with roots and tiny, scale-like leaves (called microphylls) that cover the stem above ground.

Ferns and lycophytes have differing evolutionary lineages as well, but I’ll spare you the details.

The current state of taxonomy is way different from what we learned in grade school. It gets complicated because there are different systems and the scientific community doesn’t seem to be in agreement about which one best fits our current understanding of evolutionary history.  For anyone who’s interested, here’s a little detour.

One widely used system (Woese) starts with domain, of which there are three; kingdoms are the next step down.  The differentiation is rather technical, but the domains are named Archaea, Bacteria, and Eukaryota.  The plant kingdom (Plantae) is in the last of these.

ITIS (the Integrated Taxonomic Information System, one of the more authoritative sources) has adopted a seven-kingdom system as its standard. The kingdoms are  Bacteria, Protozoa, Plantae, Fungi, Animalia, Chromista, and Archaea.

A google search on the phrase “kingdoms of life” will show other systems, dividing life into five or six kingdoms.

In ITIS, the next levels below kingdom are more divided than in the old KDCOFGS system.  If you go down the tree looking for ferns and lycophytes , you’ll see below the plant kingdom two subkingdoms; the one containing ferns is divided into two infrakingdoms; one of those is composed of two superdivisions; then after that come the divisions, of which there are eight.  Ferns and lycophytes are in the Tracheophyta (vascular plants).

Ignoring the three subdivisions, there are seven classes within the division Tracheophyta:

Cycadopsida: cycads (seed plants that vaguely resemble palms)
Ginkgoopsida: ginko (Gingko biloba, all by itself way up here in the taxonomic hierarchy!)
Gnetopsida: three genera of woody plants resembling conifers
Pinopsida: conifers (non-flowering, seed-bearing plants)
Magnoliopsida: flowering, seed-bearing plants
Lycopodiopsida: clubmosses, firmosses, spikemosses, quillworts
Polypodiopsida: ferns

Older field guides and text books refer to certain plants as “fern allies” or “fern relatives”.  These include the clubmosses, firmosses, ground cedars, horsetails, scouring rushes, quillworts, and a few others.  Of those, horsetails and whisk ferns are now considered to be true ferns.  The rest are considered lycophytes.  All of this reclassification is quite recent and based on molecular phylogenetic studies.

The point I’m trying to make, other than taxonomy is messed-up but fascinating, is that ferns and lycophtyes are only distantly related to the flowering plants I usually write about.  But they are abundant, beautiful, and interesting, so I’ll be posting about them.

20140605-20140605-DSC_0034-2

 

a lycophyte, commonly called “ground pine”, generally known as a “clubmoss”, but it isn’t in the same class as pines, and isn’t in the same division as mosses!

 

 

Next time, a look at fern morphology and nomenclature.

More Flowers Found in New York

20150717-20150717-_DSC0030

wild basil
Clinopodium vulgare
Lamiaceae
scattered distribution throughout the US and Canada, but solidly in the Northeast, Mid-Atltantic, and upper Midwest

 

20150717-20150717-_DSC0023

New Jersey tea
Ceanothus americanus
Rhamnaceae
throughout the eastern US and Canada into the Great Plains
threatened in Maine

 

 

20150717-20150717-_DSC0016

purple-flowering raspberry
Rubus odoratus
Rosaceae
found through most of the eastern US and Canada except some parts of the deep South
endangered in Illinois, threatened in Indiana

 

20150717-20150717-_DSC0033

wintergreen
aka eastern teaberry, checkerberry
Gaultheria procumbens
Ericaceae
found throughout the eastern US and Canada, excluding Florida
supposedly Clark’s Teaberry Gum was named for this plant, though I couldn’t determine if any part of Gaultheria procumbens was ever used in manufacturing the stuff.  When I was a child Teaberry was my favorite.

20150717-20150717-_DSC0034