Observation 76940: Thelotremataceae Stizenb.
When: 2011-09-18
Who: zaca
No herbarium specimen

Notes: Below I summarize some of the features of this lichen:
- Thallus: crustose, areolate, more or less plane, thin, with up to 5 cm wide;
- upper surface: whitish or whitish gray, dull, scarcely pruinose;
- photobiont: a green alga, cells up to 14 µm in diameter;
- Ascomata: immersed in the thallus, first perithecia-like, then lecanoroid apothecia, urceolate;
- hymenium: hyaline, I-;
- hypohymenium: brown;
- asci: cylindrical to clavate, up to 65 µm long, 8-spored (I presume);
- spores: hyaline, septate (althoug it’s not clear how is the septation) with average dimensions: Me = 13.5 × 5.3 µm ; Qe = 2.6 (N=7). These values were obtained from the only ascus with more or less mature spores observed.
- paraphyses: long, thin (1-2 µm), well separated from one another.

Due to the similarity of the thallus with that of Diploschistes I search to close genera. I found some similar species in the genus Thelotrema, namely T. lepadinum – see Stridvall – and T. antoninii – see azoresbioportal. However, none of these seems to be the species of my specimens, because the first one lives on bark and the second have completely different spores. After I found a webpage of corticolous species the family Thelotremataceae in Costa Rica with a lot of information. Again, in spite of the similarity with some, none match completely. Most of them have many sepate or muriform spores and very few with few septa. Another source of information is the big paper of M.E. Hale Thelotremataceae_in_Panama, which maybe can help if one can first identify the genus. Note that, for instance, only the genus Ocelullaria has about 175 species.

Images

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170075
170076
Habitat.
170077
Other specimens and chemical reactions.
170078
Microscopy – I.
170079
Microscopy – II.

Proposed Names

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Created: 2011-09-22 15:09:59 EDT (-0400)
Last modified: 2011-09-22 15:10:00 EDT (-0400)
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