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Motivated by observation 166070 I go back to my previous observations of L. lichenoides and saw, in particular, the comment by Jason. According to my recent reference on the subject (see below), his comment does not apply to the Leptogium lichenoides in my country. I quote from that paper, in the observations to the species:
“Readily distinguished from closely related taxa by isidia morphology. Some specimens present abundant arachnoid tomental hairs in the lower surface, a character that has already been signalled by Jørgensen (1973) for this taxon, which may thus be confused with L. juressianum. These species differ in the shape and size of lobules.”
REF: López de Silanes et al., Leptogium in mainland Portugal, Sydowia 64(1): 67-102, 2012.
but I also have many doubts.
Rules out L. lichenoides. The British Flora lists only three species with isidia and tomentum underneath:
L. saturninum — looks quite different, a species I’m very familiar with
L. hibernicum — strongly wrinkled-striate, patchy isidia and/or marginal phyllidia, uniformly very thinly tomentose below, hairless above
L. juressianum — wrinkled/not(?), granular marginal or laminal isidia, patchy thick tomentum below, upper surface densely grayish tomentose
Irish Lichens has the last two (MO covers L. saturninum well), but neither looks quite like yours.
Created: 2012-06-24 10:32:40 PDT (-0700)
Last modified: 2012-06-24 10:48:10 PDT (-0700)
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