Observation 63621: Thelomma occidentale (Herre) Tibell

on fence (typical substrate for this species)

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Proposed Names

83% (1)
Eye3 Eyes3
Used references: Tibell, L and Ryan, B.D. (2004) “Thelomma” pp. 533-536 in Nash III, T.H., Ryan, B.D., Diederich, P., Gries, C. and Bungartz, F. (eds) Lichen Flora of the Greater Sonoran Desert Region, Volume 2
Based on microscopic features: spores 1-septate, constricted at septum, average 21 × 12 micron (surface appears more uneven than as describred by Tibell and Ryan)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Jason Hollinger (jason)
2011-02-21 19:33:13 CST (-0500)
comparison with T. mammosum
By: Richard Droker (wanderflechten)
2011-02-21 19:23:38 CST (-0500)
T. mammosum (for which I’ll post an observation) is not uncommon in the Pacific Northwest on Si rock, particularly near salt water. Its spores are non-septate and spherical, in contrast to T. occidentale, which in my experience in Washington is not very common, and usually is found on wood, particularly fence posts.
Beautiful specimen and spores!
By: Jason Hollinger (jason)
2011-02-18 21:10:55 CST (-0500)

How does this differ from T. mammosum?

Created: 2011-02-18 20:38:35 CST (-0500)
Last modified: 2011-02-18 20:43:59 CST (-0500)
Viewed: 153 times, last viewed: 2018-06-24 06:40:44 CDT (-0400)
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