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Niebla undulata
''Niebla undulata'' is a fruticose lichen that grows on rocks in the fog zone along the Pacific Coast of Baja California in the Northern Vizcaíno Desert, and also in the Channel Islands (Santa Cruz Island).〔Spjut, R. W. 1996. ''Niebla'' and ''Vermilacinia'' (Ramalinaceae) from California and Baja California. Sida Bot. Misc. 14〕 The epithet, ''undulata'', is in reference to the wavy margins of the thallus.
==Distinguishing Features==
''Niebla undulata'' is distinguished by a bluish green thallus to 6 cm high and 6 cm broad, divided into curly ribbon-like branches from a short tubular base, and by the presence of the lichen metabolite divaricatic acid, with triterpenes. The primary branches, which are less than 20 in number, are loosely connected at base to a yellowish pigmented holdfast, blackened slightly above base, curved upwards or widely spread apart, sometimes horizontally to the extent that they creep along the rock, and they are undulate both broadly and shortly along margins. The undulate margins appear related to the development of black dot-like pyncidia or by the development of apothecia (ascocarp). The cortex is relatively thin, 35–75(-100) µm thick, with prominent raised vein-like ridges, the longitudinal ridges not defining the branch margins, interconnected by diagonal ridges that fork and join other diagonal ridges, all forming a reticulate net.〔 The relatively thin cortex also relates to the contorted branches as seen in other species. Apothecia are variable in their density along margins, occasionally solitary, more often aggregate, the individual apothecium generally appears as if pinched outwards from the branch margin on a short broad lobe.〔
Similar species, which contain divaricatic acid, are ''Niebla sorocarpia'' that differs by the larger thallus with longer tubular basal branches, by the aggregate apothecia—appearing to have resulted from aborted development over time on narrower short finger-like terminal lobes, and by the cortex appearing to wear off on terminal lobes; ''Niebla podetiaforma'' and ''Niebla turgida'', distinguished by the yellowish green color, the reticulate ridges oriented transversely near the tips of the branches, and the bulging cortical surface between the ridges; ''Niebla dilatata'' and ''Niebla caespitosa'' that differ by the flattened branches, ''Niebla rugosa'', distinguished by the ladder-like arrangement of the transverse cortical ridges; ''Niebla laminaria'' that has a thicker cortex; ''Niebla contorta'', distinguished by the smaller thallus, and finally ''Niebla juncosa'' that differs by the longitudinal cortical ridges that define the branch margins.〔 Among other chemotypes, ''Niebla lobulata'' is most similar, distinguished by the containing sekikiaic acid.〔
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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