Observation 57665: Punctelia Krog

When: 2010-10-28

Collection location: Kalatope wildlife Sanctuary, Dalhousie, Himachal Pradesh, India [Click for map]

Who: Alok Mahendroo (alok)

No specimen available

On stone..

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Recognized by sight
56% (1)
Recognized by sight

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By: Jason Hollinger (jason)
2010-11-01 02:47:01 CST (+0800)

Again, sorry I know nothing about Indian flora… But the genus is fairly certain in this case. Punctelia is a very large widespread genus distinguished by those white dots all over the surface. Things you want to look for (in order to determine species, that is) include soredia (tiny granules where the surface looks like it is eroding), isidia (shiny little balls or fingers, sometimes branched), phyllidia (tiny flattened outgrowths, usually along the margins or along stress-cracks on the surface, but at least one species has them covering the entire surface), apothecia (cup-like fruiting bodies). Color and quality of rhizines underneath can sometimes be useful, too. Some of these features require magnification, at least until you become comfortable diagnosing them. Lastly… there is one additional genus with white dots on the surface, Flavopunctelia, but it is distinctly green and not at all bluish like this (although, again, blue reflected light from the sun can give photos a false bluish cast). Good luck!