Observation 201406: Rhizocarpon lecanorinum Anders
When: 2015-03-21
Who: zaca
No herbarium specimen

Notes: Growing on granitic rock.

Proposed Names

58% (1)
Eye3
Recognized by sight
61% (2)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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This seems consistent with R. lecanorinum
By: Jason Hollinger (jason)
2015-03-31 13:22:29 PDT (-0700)

Concerning R. lecanorinum versus R. ferax, the Swedish Flora directly compares the two in couplet 22 on pg. 313:

22a. Thallus to 1 cm, alpine, medulla K-, apothecium rim obvious . . . R. ferax
22b. Thallus to 8 cm, southern, medulla K+y, apothecium rim inconspicuous . . . R. lecanorinum

(Assuming my translation from Swedish is correct! :)

Microscopy added.
By: zaca
2015-03-31 13:13:51 PDT (-0700)

Spores:
(35) 39.2 – 48.4 (64.1) x (15.2) 16.5 – 22 (23.5) µm
Q = (1.8) 2 – 2.7 (3.9) ; N = 39
Me = 44 × 19.1 µm ; Qe = 2.3.

I believe you
By: Jason Hollinger (jason)
2015-03-24 14:13:05 PDT (-0700)

I’ve never (knowingly!) seen R. ferax. That would be brand new for me, too.

Good tips, Jason!
By: zaca
2015-03-24 14:09:43 PDT (-0700)

Concerning the specimens you proposed as R. lecanorium / R. ferax I noticed the so-called “lecanorine apothecia” and I bet for the first of this pair of species, since in R. ferax the areolas are more globose, at least judging from the photos I saw. But let’s wait for the microscopy, as I have samples of these three specimens.
Thanks, Jason, for the proposals and hints.

Again, maybe R. lecanorinum or R. ferax
By: Jason Hollinger (jason)
2015-03-24 09:02:42 PDT (-0700)

Created: 2015-03-23 14:15:09 PDT (-0700)
Last modified: 2015-03-31 13:27:11 PDT (-0700)
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