Observation 102813: Aspicilia knudsenii Owe-Larss. & A. Nordin
When: 2011-09-28
(34.0821° -118.7521° 608m)
Herbarium specimen reported

Notes: HABITAT oldgrowth chaparral and conglomerate outcrops at top of high transverse ridge; SUBSTRATE north face of conglomerate cliff; ASPECT shaded; NOTES thallus tiny gray rimose crust, cortex K-, medulla K+y-o/r, black sunken apothecia with slightly raised white-pruinose margins, epihymenium dark olive-green POL- turning brown in K, hymenium hyaline POL-, cortex POL+ epinecral layer over brown POL- layer over hyaline POL- layer, algae thick and continuous below cortex, medulla POL+ weakly K+y clearing mostly in K, paraphyses with 0-1 cells slightly swollen, conidia rod 12-15 × 1-2 µm; SPORES 25 × 15 µm.

Given K+ medulla, 25µm spores and 15µm conidia, this can only be either A. pacifica or A. anglica. But the paraphyses should be distinctly moniliform for both species. If you relax the restriction on conidia length, it could be A. knudsenii (submoniliform) or A. santamonicae (moniliform). Sonoran Flora mentions specimens with longer conidia. I wonder how important the submoniliform paraphyses are? If important, then this is clearly A. knudsenii.


Thallus, at 30×.
Apothecial section, in water, at 100×.
Apothecial section, in water, at 100x, cross-polarized.

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Verified / corrected observations
By: Jason Hollinger (jason)
2016-03-12 01:40:28 CST (-0600)

Thallus is P+ deep orange indicating at least some stictic acid. There were no crystals in K.

Paraphyses with 1 rarely up to 3 tiny globose end-cells, definitely not fully moniliform.

Spores are consistently 8 per ascus, ~28-30×15-20µm.

Conidia are 10-14µm, avg. 12-13µm.

Created: 2012-07-25 20:13:19 CDT (-0500)
Last modified: 2012-07-25 20:13:31 CDT (-0500)
Viewed: 46 times, last viewed: 2016-10-22 02:05:16 CDT (-0500)
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