Happy Campers

Day 21: Although most of us don't enjoy being out in the cold and wet, the lichen population heartily approves our sudden switch from summer to winter. They perked up in a matter of days, going from crisp and fragile to soft and pliable in an astonishingly short period of time. Lichens are amazingly resilient, sometimes springing back to life from a state where they are dry enough to crumble into powder between your fingers. Many species have begun to fruit, their apothecia readily apparent. Here are examples from four of the genera common to my yard: Platismatia (aka Ragbag), a Cladonia species, Usnea and one of several Hypogymnias which grow in abundance on the cedar fence. Happy campers, these! They won't grumble about chilly nights and soggy moss-beds. They'll revel in them!

Fence Gardening

Day 21: I take as much pleasure in what grows in my garden naturally as I do in the species I carefully cultivate. My rail fence is a wonderland of lichen forms, from squamous and cupped Cladonias to thready Usneas and puffy Hypogymias. They are colourful as well as diverse in shape and size, ranging from lime green through grey-green or sometimes tinted with a blush of orange or pink. The fruiting bodies (apothecia) of the Cladonias dot the colonies with specks of brown and brilliant red, and one could imagine that the faerie folk were decorating for the holidays. A four inch by four inch section of rail may hold a forest of half a dozen species, each one as alien in appearance as the next. Take a closer look at lichens when you're on the trail. You may become as fascinated by them as I am.

Mr. Hypogymnia

Day 356: I think anything I might say about this Hypogymnia specimen would be superfluous. Just be sure you notice the cute little painted "toenails."

Lichen Basics

Day 106: This is the type of dry reading you're likely to see on official NPS pages from here on out, but at least it's science.

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Those of us who live in the Pacific Northwest are fortunate to have a wide variety of lichen species in our forests. Although lichens appear in almost every geographic region of North America, the leafier types are more abundant on the northwest and northeast coasts. Many of them are mistakenly called "mosses," but in fact they are complex symbiotic organisms. One of the most exciting revelations in the field of lichenology occurred this year when a third component was identified in the classic "fungus/algae" pairing: yeast. Let's look more closely at some common PNW lichens and learn a little of the specialized terminology which describes them.

There are three basic types of lichen: foliose, fruticose and crustose. Foliose ("FOH-lee-ose") lichens are "leafy" (think "foliage"). Platismatia (upper left) is an excellent example. Fruticose ("FROO-ti-cose") lichens are bushy or shrubby, or have a three-dimensional structure which often includes round stalks topped by cups or knobs. The photo in the upper right shows an example of Cladonia, a classic fruticose family.

Sometimes, it is difficult to assign a lichen to a specific category. The lower left image shows a Hypogymnia. The Hypogymnias are classified as "foliose-fruticose." The last type of lichen is called crustose ("CRUST-ose"), and as you might guess, it forms a crust which adheres tightly to trees and rocks. Crustose lichens often exhibit small fruiting bodies such as those which appear on Ochrolechia (lower right).