Hypogymnia Physodes

Day 168: Collectively, the Hypogymnias are commonly known as "tube lichens." Why? If you examine one closely, you will see that the lobes are puffy, like miniature balloon animals. In some species, this resemblance is accentuated by each lobe being pinched at the base. Hypogymnia physodes does not exhibit these restrictions, but it has another characteristic which makes it relatively easy to identify, and one which gives it its common name of "Monk's-hood Lichen." The inset takes a closer view of the lobe tips, revealing the powdery or granular soralia (asexual reproductive structures) typical of this species. Where the soralia have fallen away, the tubular nature of the lobes becomes obvious. The lower surface of this lichen is black, but if it is separated from the upper layer to reveal the underside of the pale green top (the medullary ceiling), it will be seen to be white. Differences in the colour of the medullary ceiling are also diagnostic when trying to identify Hypogymnias.

Maine Amusement

Day 7: Patty's thoughtful contribution to my Maine amusement kept me occupied for the better part of one evening and a sizeable chunk of morning. Once they had rehydrated sufficiently for me to be able to separate the layers for a look at the medullary ceiling, I confirmed that the Hypogymnia was H. physodes, a species which also grows in the Pacific Northwest. The Bryoria was a bit more challenging because it was quite dry and wiry even after soaking. Of course stiffness is characteristic of Bryorias. That's why they're known as "horsehair lichens," but this one was exceptionally crisp and only a small bit was present, tangled in the sample of Platismatia tuckermanii. The specimen was somewhat darker than our local version, a factor I attribute to a more abundant algal component. Indeed, more blue-green algae was present in two of the Platismatia colonies than in the third, and the sample of Bryoria had been extracted from one of the darker Platismatias. Lichen colour can be quite variable depending on the amount of algae in the tissue. Even so, my identification of Bryoria capillaris is somewhat hesitant; the taxonomy is currently in a state of flux with various sources disagreeing on whether or not east-coast populations should be considered separate from those on the west coast. I've gone with the lumpers in this case.

Hypogymnia Phys...Waitaminit!

Day 293: Hypogymnia physodes is a fairly common lichen in the Pacific Northwest. Like other Hypogymnias, its lobes are tubular, and distinguishing the particular species sometimes involves separating the grey-green top surface from the black bottom surface so that the medullary ceiling can be observed. A member of our Morris dance side handed me a small brown box containing a specimen at Monday's dance-out, and I recognized it immediately as a representative of the tube lichens.

Seriously, though...when Tink handed me a tiny package, I was puzzled. There was no special event to commemorate. What could it possibly contain? I lifted the lid and found this darling lichen pendant which she had picked up at a craft fair. "I knew you had to have it, Crow," she said. If not H. physodes (shown here growing on a fir tree in my yard), it is certainly a member of the genus and as such, is destined to become one of my favourite pieces of jewelry. Thank you, Tink!

Hypogymnia Physodes

Day 52: My fence is home to quite a variety of lichens, and calling to mind the cobbler's kids and their bare feet, I have to admit that I've never troubled myself to identify many of them. Generically, they're "fencepost lichens" in a hypothetical field guide to Crow's yard, a category which includes Usneas, Cladonias and Evernia, distinguished only by their attachment to cedar rails. I've never taken samples, never looked at potential identifying features until recently when I was prompted to do so by finding several of these small rosettes growing on the side of my house. Anything which can survive on a substrate of plastic is worthy of further study, so today I nicked a lobe and brought it indoors for examination. Thinking I had a fairly good idea where it belonged, I attempted to fit it into a family, but square peg that it was, it refused to go in the round hole. I don't know what compelled me to scrape at the dark underside with my thumbnail, but when I did so, it came away freely, revealing a white medullary ceiling. What? Waitaminit...it's a Hypogymnia! From the moment of that epiphany, the rest of the pieces fell neatly into place: Hypogymnia physodes, "one of the most common tree lichens in the north." Tree lichen, eh? Mine have a taste for vinyl siding.