Observation 197952: Carbonea assimilis (Körber) Hafellner & Hertel
When: 2014-10-04
(38.9867° -114.3153° 3913m)

Notes: on Pleopsidium flavum on quartzite; rocky broad northwestern ridge of summit, geology a mixture of siliceous metamorphic rocks; on broad ridge about 0.1 miles northwest of west peak (about 75m west of main peak)

thallus verrucose-areolate growing out of host areoles finally covering most of host, areoles irregular olive-brown dark ±shiny, apothecia black dull ±convex with reflexed margin, epihymenium aeruginose turning green in K, hymenium hyaline clear ±80um, hypotheciu hyaline with some clusters of algae, exciple browner than epihymenium, medulla POL± milky weak, cortex K- C- (in section) KC-, medulla K- C- (in section) KC-, paraphyses sparingly branched barely swollen at unpigmented tips easily separating in K, asci clavate with K/I± weak walls and K/I+ blue thollus with broad apical canal broadening dramatically toward tip, spores 8 per ascus hyaline smooth all simple ovoid to ellipsoid (9)10.3+/-1.2(12)x(5)5.5+/-0.6(6.5)um Q=(1.5)1.9+/-0.15(2.0) (N=10)


at 20x, stacked
at 40x, stacked
at 20x, stacked
at 40x, stacked
apothecium section, in water and K, at at 100x
ascus, in K/I, at at 400x
on Pleopsidium flavum

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Further information on Carbonea
By: Jason Hollinger (jason)
2015-07-20 16:35:07 CDT (-0400)

The Russian Flora has an excellent treatment of the genus. There are also descriptions on the LIAS website and in the British Flora. Apparently the data in the LIAS website is unofficially the latest and greatest for the genus. I’ve painstakingly extracted all the data for all the known species from LIAS. Only four species are parasitic and possess a distinct thallus of their own (separate from the host thallus):

C. atronivea — white, with atranorin
C. distans — white to yellowish-brown, with atranorin
C. intrusa — brown to gray-black, rough, with an anthraquinone (visible as orange patches in hymenium), spores 3.4-5.6µm wide
C. assimilis — bright brown, smooth, with no chemistry, spores 5-9.5µm wide

C. assimilis and C. intrusa are the only viable candidates. (C. intrusa is also known as Scoliciosporum intrusum in some floras.) Both species have been reported from North America. The Russian Flora compares C. assimilis to Lecidea atrobrunnea and Miriquidica deusta, emphasizing the “bright” brown, shiny, convex thallus, and apothecia with distinct and persistent rims. I haven’t taken the time to translate the Russian description of C. intrusa yet. Both are found on a wide range of crustose hosts on siliceous rocks.

Created: 2015-02-03 02:03:01 CST (-0500)
Last modified: 2015-07-20 16:35:45 CDT (-0400)
Viewed: 36 times, last viewed: 2016-10-24 23:17:05 CDT (-0400)
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