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General:
Common Name: The Rocktripe Lichens. Traditional, reflecting the strict occurrence of the species over rock and the apparent use of a species of the related genus Umbilicaria as food during famine.
Medium to large stratified foliose lichens, corticate above and below, lacking isidia (ours), lobes attached to substrate by a more or less central holdfast, usually rotund, rather thin, thallus averaging to 6–15 (–25) cm across. Upper surface dark brown, blistered/pustulate. Lower surface black (ours), papillate, lacking rhizines.Photobiont green.
Apothecia located over upper surface, disc black; spores multi-celled, ellipsoid, brownish, 1 (rarely 2) per ascus.
Notes: Lasallia is primarily a temperate genus; of the eight species described worldwide, three occur in North America and one in B.C.
Species description:
Upper surface bearing well-spaced, discrete blisters/pustules, ridges absent; apothecial disc plane AND
Lower surface black, distinctly textured
Comments:
Lasallia papulosa is also reported for B.C., though the record is questionable
Reactions:
Medulla C+ reddish, KC+ reddish.
Contents:
Gyrophoric and ovoic acids, with traces of lecanoric and hiascic acids (umbilicaric acid).
Source: Lichens of British Columbia |
