Microconidial Dimorphism in the Lichen Genus Parmelia

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Abstract
The 1st microconidial dimorphism in noncrustose lichen-forming fungi to have ecogeographical correlations is reported from 2 North American species. The microconidia of P. hypoleucites and those of P. semansiana sp. nov. differ in length, the former averaging about twice (11-12 .mu.m) as long as the latter (5 .mu.m). P. hypoleucites, apparently an obligate epiphyte of trees, is confined to the highlands of Mexico and Arizona [USA]. P. semansiana, primarily a rock-inhabiting species that extends its substrate tolerance to bark at the center of its range, is widely distributed in south-central North America. Small but significant spore-size differences accompany the microconidial dimorphism.

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