Observation 212659: Peltula euploca (Ach.) Poelt

When: 2015-08-11

Collection location: Lourinhã, Portugal [Click for map]

Who: zaca

No specimen available

Growing on soil at a cliff over the see. the site is devoid of vegetation, except small shrubs of the genus Juniperus.

If I’m coorect in the appreciation of this specimens, this is my first observation of the genus Peltula. The thallus (or better, the thalli) is composed of isolated squamules, of more or less 3 mm in diameter, that coalesce at places. Each squamule is rounded, brownish with rugose upper side, being attached to the soil at a central single point ; some are divided showing new olive green shoots; many of them have the margin with a blackish mass that I interpreted as soredia. In the field, to the nacked eye, they seem similar to Placidium and alikes, but magnifying there is a big difference. I made a section of the thallus and observed it under the scope; the result is the photo attached, that in not as informative as desirable, but clearly show the existence of two immersed apothecia. Unfortunately the slide brokes down before I could see the details, but the single existence of apothecia showed that this was something new for me.
After this I recalled a recent paper devoted to a hot-spot area in Portugal for the genus Peltula having 9 different species (see the reference). Going throughout it I found that my specimens are similar to those of the widespreaded and polymorphic species P. euploca. Some of its morphs are mentioned at the paper and my specimens seem to be an intermediate between the usual form and the so-called polyphyllous form.


Microscopy: A section of the thallus where the part of an apothecium is put in evidence.

Proposed Names

58% (1)
Eye3 Eyes3
Recognized by sight
Used references: Joana Marques, Matthias Schultz and Graciela Paz-Bermudéz: A Peltula Nyl. diversity hotspot in north-east Portugal, with one species new to science and three species new to mainland Europe, The Lichenologist 45(4): 483–496 (2013).
Based on microscopic features

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Eye3 = Observer’s choice
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Created: 2015-08-13 03:54:24 CDT (-0500)
Last modified: 2015-08-13 07:41:32 CDT (-0500)
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