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1 April 2014 Herpothallon inopinatum (Arthoniaceae), a New Lichen Species from Mexico
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Abstract

Herpothallon inopinatum Frisch & G. Thor sp. nova (Arthoniaceae) is described from Chiapas, Mexico. It is the second species of Herpothallon known with mature ascospores besides H. fertile. It differs from H. fertile in smaller asci immersed in the thallus instead of strongly protruding barrel-shaped thallus warts, smaller bean-shaped ascospores and a thallus chemistry of confluentic and chiodectonic acids. Herpothallon inopinatum most closely resembles H. pustulatum, but differs in the absence of pustules. The closely related H. rubrocinctum has distinct bright-red pseudoisidia and a bright-red pigmentation of pro- and hypothallus, while H. inopinatum lacks pseudoisidia and has a pro- and hypothallus white mottled pale yellow to orange to purplish brown. A revised key to all 34 currently accepted species in Herpothallon is provided.

© Finnish Zoological and Botanical Publishing Board 2014
Andreas Frisch, Jörgen Rudolphi, and Göran Thor "Herpothallon inopinatum (Arthoniaceae), a New Lichen Species from Mexico," Annales Botanici Fennici 51(1–2), (1 April 2014). https://doi.org/10.5735/085.051.0108
Received: 19 July 2013; Accepted: 7 November 2013; Published: 1 April 2014
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