|User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote.|
|I’d Call It That||3.0||0.00||0|
sum(score * weight) /
(total weight + 1)
was not addressed to me, but I’ll give my opinion.
The present classification of Graphis is made on the basis of several features, many of then only available at a microscopic level. Someone interested can give a look to the paper, referenced below, containing a world key for the genus. The main ingredients are:
Labia striation (yes/no), excipulum carbonization (3 degrees: apical, lateral or complete), hymenium (clear/inspersed), ascospores (muriform/transversally septate)
where only the first one can be recognized from photos (but you will need close-ups). Next you will need other features, like: chemistry and ascospore size.
Summarizing, only one of the features mentioned can be infered from a photo.
To help with the classification the key also presents several “lirellae-morphs”, which are related with the morphological characteristics:
Lirellae emergence, existence or not of a thalline margin, lirellae branched or not, size of the lirellae, disc exposure, labia or disc pruinosity.
The problem is that in several cases the same morphology correspond to distinct microscopic features.
In the case under evaluation, I think we can say that:
- The lirellae are (emergent to) prominent;
- A thalline margin is lacking, or if it exists is at a basal level;
- Some lirellae seem to have the disc partilly exposed and with some pruinosity (need a closer photo to see in detail);
but this don’t give rise to a “lirellae-morph”, there are several.
Finally, better photos could help, but still then we will be far away from an identification.
Last but not least: Very nice specimen and photo; Congratulations, Jimmie.
Robert LÜCKING, Alan W. ARCHER and André APTROOT
A world-wide key to the genus Graphis (Ostropales: Graphidaceae)
The Lichenologist 41(4): 363–452 (2009)
is it possible to ID any “Graphis sp.” lichen I find without microscopy?
American beech (Fagus grandifolia). And I’d guess the nearby black lines are a Graphis sp.
and absolutely wonderful. I want to find some of that!!! Awesome “find” and great photo.
Created: 2015-04-29 18:30:45 CDT (-0500)
Last modified: 2015-05-03 21:49:07 CDT (-0500)
Viewed: 251 times, last viewed: 2017-03-18 08:23:18 CDT (-0500)