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Niebla homalea
''Niebla homalea'' is a species of fruticose lichen that grows on rocks in foggy areas along the Pacific Coast of North America, from Mendocino County, California south to Bahía de San Quintín on the main peninsula of Baja California, with an isolated occurrence further south on vertical rock faces above Punta Camachos, and other occurrences in the Channel Islands and on Guadalupe Island.〔Spjut, R. W. 1996. ''Niebla'' and ''Vermilacinia'' (Ramalinaceae) from California and Baja California. Sida Bot. Misc. 14〕 The epithet ''homalea'', given by Acharius, suggests it was in regard to the branches appearing flattened.
==Distinguishing Features==
''Niebla homalea'' is recognized by the thallus divided into narrow subcylindric, mostly linear shaped〔Linear: having parallel margins 10 or more times longer than wide〕 branches that have a glossy cortex frequently cracked along transverse ridges and by the branch margins alternating 90° in their orientation at frequent but irregular intervals; the branches are 4–8 cm long, 1–3 mm wide. Apothecia, when present, develop terminally, and are flattened towards base where attached to branch. The key lichen substance is divaricatic acid, with accessory triterpenes and usnic acid. Similar species include ''Niebla eburnea'', distinguished by a glazed (ivory) cortex, often with wrinkles or ripples instead of transverse cracks, and by the branch margins alternating with the cortical ridges more near base and apex; ''Niebla testudinaria'', distinguished by the reticulate ridges between branch margins, and ''Niebla disrupta'' that differs by the lichen substance, sekikaic acid. Both ''N. eburnea'' and ''N. testudinaria'' frequently have irregularly dilated branches, especially above mid region, which helps separate them from ''N. homalea''. ''Niebla disrupta'' generally has apothecia, usually more developed below mid region of the thallus, and usually with an extended spine-like branch, whereas in ''N. homalea'', apothecia appear less frequent and mature more near apex of branches, often on a short truncated branch, occasionally with a continuing flattened branch.〔''Niebla homalea'', World Botanical Associates, http://www.worldbotanical.com/niebla_homalea.htm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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