Observation 50529: Melanohalea exasperatula (Nyl.) O. Blanco et al.

Habitat: Growing about 2 m above the ground on a willow tree, Salix, with primary stem about 4 cm dbh.

Identification: Epiphytic Melanohalea and Melanelixia differ in the form of their isidia. The present photos show lobulate isidia, suggesting two species in particular (characterizations from McCune and Geiser, 2009, pp.195-204):
Melanohalea exasperatula (“isidia begin in a bulbous form, pinched at the base and distinctly roundish”)
Melanohalea subelegantula (“initially cylindrical isidia, which develop into lobules”)
These photos seem to represent the former condition (see especially the young isidia along lobe margins), so I am calling these lichens Melanohalea exasperatula. Both of these species are recorded from Grand Teton National Park.

CNALH Melanohalea exasperatula images, description, and locality map, and a larger, interactive locality map.

NPLichen: A Database of Lichens in the U.S. National Parks – Grand Teton National Park, Wyoming

Sharnoff’s Melanohalea exasperatula gallery

Timdal’s Melanohalea exasperatula gallery

Proposed Names

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Used references: McCune and Geiser, 2009, pp.195-204

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Created: 2010-08-17 11:33:29 CDT (-0500)
Last modified: 2010-08-17 12:06:07 CDT (-0500)
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