Observation 179423: Collema fragile Taylor
When: 2014-09-14
Who: zaca
No herbarium specimen
0 Sequences

Notes:
This is certainly one of the rare species of Collema in Portugal. It has a distinguish feature, which however is difficult to observe, because the hialine hairs existing at the lobe tips are so to say “hidden” that only noticed them after arriving to the conclusion that no other possibility exist (at the full magnification of the attached photo one can see them). In fact, taking the dimensions into account (this specimen had about 2 cm in diameter), macroscopically there are some similar, like C. leptogioides, C. multipartitum and C. parvum. Two of them can be eliminated, the first one because lacks isida and the last one because was never observed fertile here. Concerning C. multipartitum it has spores of different shape (ellipsoid to fusiform and 3-septate).
I obtained the following dimensions for the spores:
(21.9) 26.9 – 35.1 (39.7) x (10.6) 11.3 – 14.2 (14.4) µm
Q = (1.6) 2.3 – 2.8 (3.1) ; N = 30
Me = 30.8 × 12.5 µm ; Qe = 2.5.

Images

457828
Microscopy: Apothecial section;
457829
457830
Microscopy: Apothecial section;
457831
Microscopy: Apothecial section-details;
457832
Microscopy: Hymenium;
457833
Microscopy: Asci;
457834
Microscopy: Spores.

Proposed Names

87% (1)
Eye3 Eyes3
Recognized by sight
Used references: P. Carvalho, Collema, Sociedade Española de Liquenología, Flora Liquenológica Ibérica, vol. 10, 2012; British Flora: Smith et al., The Lichens of Great Britain and Ireland, British Lichen Society, 2nd ed., 2009.
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2014-09-18 17:52:27 JST (+0900)
Last modified: 2014-09-19 02:21:12 JST (+0900)
Viewed: 39 times, last viewed: 2017-09-09 15:04:03 JST (+0900)
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