Observation 210776: Abrothallus De Not.
When: 2015-05-18
(31.8729° -109.2828° 896m)

Notes: 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

Images

540580
20150518-44-83.jpg
at 20x, stacked
540581
20150518-44-84.jpg
at 40x, stacked
540582
20150518-44-101.jpg
apothecium section, in water KOH and K/I, at 400x

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Comments

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I’ve talked to Paul Diederich about this specimen
By: Jason Hollinger (jason)
2015-07-20 16:51:13 CDT (-0400)

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 16:43:12 CDT (-0400)
Last modified: 2015-07-20 16:43:17 CDT (-0400)
Viewed: 23 times, last viewed: 2016-11-29 13:15:11 CST (-0500)
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