Observation 201399: Miriquidica deusta (Stenh.) Hertel & Rambold
When: 2015-03-21
Who: zaca
No herbarium specimen

Notes: Growing on granitic rock.

Proposed Names

31% (2)
Recognized by sight
45% (2)
Recognized by sight
58% (1)
Eye3 Eyes3
Used references: See the comments of observation 203979.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I’m surprised with the extension …
By: zaca
2015-03-24 14:19:13 PDT (-0700)

of the Rhizocarpon geographicum group senso lato. I always thought of it as a small group. Many thanks Jason for sharing with me (us) your notes about this group, which are of immeasurable value and I intend to make use of them quite soon.
Regarding R. bolanderi I believe that one of these days I’ll found a fertile one, since as I told before they are quite common at this particular place.

By: Jason Hollinger (jason)
2015-03-24 08:42:30 PDT (-0700)

Yes, this species has normal but small black, lecideine apothecia, usually round, with raised rim, often bumpy at 40x because the spores and asci are so large and bulge a bit from the hymenium (a good way to distinguish from Lecidea atrobrunnea group when well-developed and really looking squamulose).

R. geographicum group sensu lato is huge!
By: Jason Hollinger (jason)
2015-03-24 08:38:16 PDT (-0700)

I’ll send you an old paper by Runemark. The taxonomy is out of date, but it may help. Here is a synopsis compiling all the information I have. Hope it helps! The R. geographicum group s. str. seems to be the messiest taxonomically. Various sources disagree significantly.

R. geographicum group – spores muriform, medulla I+ violet, epihymenium “indinstinct” (subtle character, compare with viridiatrum group)
a) R. geographicum – spores 20-35µm, K- P+o, hymenium clear; widespread
b) R. macrosporum – spores 30-60µm, K- P+o, hymenium ~greenish; widespread
c) R. riparium – spores 25-40µm, usually K+, hymenium ~greenish; widespread
d) R. lecanorinum – areoles crescent-shaped, surrounding apothecia; K+y; widespread
e) R. ferax – like lecanorinum but K- P+o; only known from Ireland?
f) R. saanaense – like macrosporum but larger areoles; arctic-alpine
g) R. carpaticum, R. intermediellum, R. atroflavescens – spores submuriform; arctic-alpine
h) R. tinei, R. lindsayanum, R.tavaresii, R. sublucidum, R. sphaerosporum – apparently synonymized away(?)
i) R. ridescens – sorediate(!); Romania

R. viridiatrum group – spores muriform, medulla I-, epihymenium dark
a) R. viridiatrum – initially parasitic; widespread
b) R. lusitanicum – initially parasitic; endemic to Portugal
c) R. subtile – initially parasitic; endemic to Greenland
d) R. oportense – 8 spores per ascus; endemic to your area
e) R. cookeanum – 2 spores per ascus; endemic to northwestern USA
f) R. tetrasporum – 4 spores per ascus; southern Europe

R. alpicola group – spores 1-septate, > 18µm, epihymenium indistinct
a) R. alpicola – “highest mountains of Europe”
b) R. atroalbescens – arctic
c) R. inarense – arctic
d) R. eupetraeoides – arctic

R. superficiale group – spores 1-septate, < 18µm, epihymenium dark
a) R. superficiale – widespread
b) R. parvum – arctic
c) R. dispersum – Spitzbergen
d) R. pusillum – parasitic on Sporostatia, alpine
e) R. effiguratum – parasitic on Pleopsidium
f) R. norvegicum – parasitic on Tremolecia; arctic-alpine

These are relatively abundant at this particular location and
By: zaca
2015-03-24 05:02:45 PDT (-0700)

share the habitat with all those in the Rhizocarpon geographicum group that I posted recently. I upload two photos of the outcrops at the place.
My problem with this particular species is that I never could observe apothecia among those orangish squamules; I suppose they are black as in the other species … or not?
Concerning the R. geographicum group, what are the representatives, besides the type species? I saw the following mentioned:
R. effiguratum, R. lecanorinum, R. riparium, R. superficiale
What else?
I started already to observe some of the samples collected and I saw that the spores have a well developed perispore (a kind of membrane envolving the spore) which causes to be almost impossible to focus them.

Yes, this looks very much like R. bolanderi
By: Jason Hollinger (jason)
2015-03-23 19:18:16 PDT (-0700)

In N. America, it almost always has K+y medulla and 2 large brown muriform spores per ascus.

Created: 2015-03-23 14:08:23 PDT (-0700)
Last modified: 2015-09-20 06:44:52 PDT (-0700)
Viewed: 75 times, last viewed: 2016-10-09 14:36:46 PDT (-0700)
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