Observation 210776: Abrothallus De Not.

When: 2015-05-18

Collection location: Flys Peak, Chiricahua Mountains, Cochise Co., Arizona, USA [Click for map]

31.8729° -109.2828° 896m

Who: Jason Hollinger (jason)

Specimen available

on Pseudevernia intensa on bark of trunk of old Pseudotsuga menziesii; old conifer forest dominated by Pseudotsuga and Pinus ponderosa; underlying rock rhyolite; apothecia black, dull, epruinose, convex from start, sessile to constricted; epihymenium ±violet-black, K+ emerald green intense; hymenium ±60um, clear, ±brownish, K± green near top; hypothecium pale to medium brown, K-; all parts K/I-; spores 4 per ascus, consistently 1-septate, finely textured, pale brown, ±constricted, one cell ±larger, ±13x6um


at 20x, stacked
at 40x, stacked
apothecium section, in water KOH and K/I, at 400x

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I’ve talked to Paul Diederich about this specimen
By: Jason Hollinger (jason)
2015-07-20 13:51:13 PDT (-0700)

He considers A. parmeliarum s.l. an option. Apparently one variety (on Usnea I think) has 4 spores per ascus. But A. parmeliarum s. str. almost always grows on a distinctive gall on the host induced by another parasite called Nesolechia oxyspora. The fascinating thing about this is that Nesolechia is apparently closely related to Parmelia s.l. A. parmeliarum s. str. usually grows on Parmelia s. str., but not always, and when it doesn’t, it is apparently usually associated with Nesolechia. Diederich has published a theory that A. parmeliarum s. str. isn’t actually associated with Parmelia s. str., per se, but rather with the closely-related Nesolechia oxyspora(!), making it an obligate hyperparasite. :) See Diederich’s 2011 paper on Abrothallus parmotrematis for more information.

At present, no species of Abrothallus are known from Pseudevernia intensa (a parmelioid lichen). More specimens will be required to ascertain where this belongs.

Created: 2015-07-20 13:43:12 PDT (-0700)
Last modified: 2015-07-20 13:43:17 PDT (-0700)
Viewed: 64 times, last viewed: 2018-03-14 09:12:36 PDT (-0700)
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