Observation 203981: Rhizocarpon viridiatrum group
When: 2015-05-01
Who: zaca
No herbarium specimen

Notes: See the Notes of observation 203977.
As a possible representative of the R. viridiatrum group I chose one with particularly big and convex apothecia.

Images

558588
Microscopy: Spores (in KOH).
519758
519759
Specimens belonging (?) to R. viridiatrum group.
558585
Microscopy: Apothecial section;
558586
Microscopy: Asci and old spores;
558587
Microscopy: Spores (in water);

Proposed Names

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Comments

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Microscopy added.
By: zaca
2015-09-25 15:13:34 CDT (-0400)

I didn’t notice any reaction to KOH in hymenium, epithecium, hypothecium or exciple. The only part which reacted K+ red was the part below the apothecia that connects it to the thallus.
Spores:
(22) 23.7 – 34.9 (36.9) x (11.9) 12.7 – 16.8 (18.9) µm
Q = (1.4) 1.7 – 2.3 ; N = 33
Me = 28.6 × 14.4 µm ; Qe = 2 .
Due to form of the spores (submuriform or muriform with few septa) and to the chemistry I think this is more close to the species model of the group, R. viridiatrum than to any other in this group. This species is known to be parasitic on other lichens (like Lecidea), but due to the age no trace of parasitism could be noticed, beyond the fact that is grew close to a Lecidea species.

Created: 2015-05-06 18:57:47 CDT (-0400)
Last modified: 2015-09-25 15:14:11 CDT (-0400)
Viewed: 44 times, last viewed: 2016-10-22 13:48:26 CDT (-0400)
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