Observation 108833: Peltigera malacea (Ach.) Funck
When: 2012-05-16
(47.4295° 116.4733° 613m)
Herbarium specimen reported

Notes: Habitat: P. ponderosa grove near clean inflow wetlands.

Photobiont: why I am having a hard time telling the difference is odd, maybe because I’m trying to project cyano onto it…some cross sections look green, others blue green… and no normal looking cephalodia present – but the dry habitat suggests there’s no way this could be a P. britannica and the surface isn’t smooth like with P. britannica.

Veins: hardly there, dark, merge together.

Lower surface: changes to black really quickly. And the area below the thin white medulla is bizarre — fluffy black hyphae, so thick, in some cases 0.25mm.

Upper Cortex: Tomentose, especially longer hairs on lobes. Not smooth. Tan when dry, parts are greenish when wet, darker green when looking from farther away.

Rhizines: tufts, some are especially fuzzy black with white tips tufts :)

Thallus: brittle, margins curls up exposing lower cortex (as opposed to margins curling down, hiding the tips of the lower cortex). The tissue exposed on some of these curled areas is kinda soredia looking, but looking under the LM at the structure, there are no photobionts in it, so can’t be soredia.

Apothecia: photos from the field indicate black apothecia, saddle

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Interesting that you’d try to make this into one of the green ones
By: Jason Hollinger (jason)
2012-09-06 02:59:39 CDT (-0400)

Because it is closely related to the green ones. This is P. malacea for sure. Your description alone was enough to clinch it, photos and habitat confirm. This is the “dry, exposed, rufescens-like” form. There is another, more luxurious form on the floor of more shaded forests, and there you may see the characteristic striking apple-greenish color (at least when wet). But out here in the sun, it turns dirty brown and curls up like this. (I was totally stumped by this form the first time, too. Thanks to Trevor for setting me straight right away.)

[Watch for P. elisabethae in places like this, too. Big difference is it has no tomentum on the upper surface, but otherwise identical.]

Created: 2012-09-06 00:37:59 CDT (-0400)
Last modified: 2012-09-16 07:47:01 CDT (-0400)
Viewed: 48 times, last viewed: 2016-10-27 13:02:32 CDT (-0400)
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