Observation 201407: Rhizocarpon macrosporum Räsänen
When: 2015-03-21
Who: zaca
No herbarium specimen

Notes: Growing on granitic rock.

Images

513673
513045
513674
Microscopy: Sections;
513675
Microscopy: Section and its K reaction;
513676
Microscopy: Asci;
513677
Microscopy: Spores;
513678
Microscopy: Yong ascus observed with the addition of melzer.

Proposed Names

29% (1)
Recognized by sight
58% (1)
Eye3 Eyes3
Recognized by sight
Used references: 1) Hans Runemark, Studies in Rhizocarpon I. Taxonomy of the yellow species in Europe, Opera Botanica, 1956.
2) Beatriz R. Valiente, PhD thesis, Phylogenetic study of the Rhizocarpon
geographicum group (Lichens, Rhizocarpaceae, Ascomycota). Compared analyses of
morphological characters and biogeographic patterns, Universidad Complutense de Madrid (Spain), 2013.
Based on microscopic features
Based on chemical features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Microscopy added.
By: zaca
2015-03-28 09:33:39 CDT (-0400)

Some features of this specimen:
Thallus: areolate, more or less continuous, prothallus black well developed;
Areolas: yellow, flat;
Apothecia: black, flat, angular, inserted between areolas;
Medulla: I+ purple/violet
Hymenium: Hyaline with some green tones; up to 170 tall;
Epithecium: red-brown; K+ red intensifying;
Hypothecium: red-brown; K+ red intensifying;
Asci: 8-spored (some appear to be 4- or 6-spored);
Spores: brown, younger light brown or bluish-brown, oblong to ovoid, muriform with many septa, big for which the following dimensions were obtained in two different apothecia:
(27.6) 31.6 – 46.9 (51.8) x (13) 14.6 – 22.9 (26) µm
Q = (1.5) 1.7 – 2.6 (3.2) ; N = 52
Me = 38.3 × 18.9 µm ; Qe = 2.1
and
(29) 30.8 – 42.4 (61) x (11.4) 16.4 – 20.4 (24.2) µm
Q = (1.6) 1.64 – 2.6 (3.4) ; N = 48
Me = 39.3 × 18.6 µm ; Qe = 2.1

Several photos attached from the microscopy (all mounts in water).

Created: 2015-03-23 17:16:08 CDT (-0400)
Last modified: 2015-03-28 09:42:18 CDT (-0400)
Viewed: 47 times, last viewed: 2016-05-10 15:58:56 CDT (-0400)
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