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Xanthoparmelia in North America. I. The Parmelia conspersa-stenophylla Group

Mason E. Hale, Jr.
Bulletin of the Torrey Botanical Club
Vol. 82, No. 1 (Jan. - Feb., 1955), pp. 9-21
Published by: Torrey Botanical Society
DOI: 10.2307/2482390
Stable URL: http://www.jstor.org/stable/2482390
Page Count: 13
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Xanthoparmelia in North America. I. The Parmelia conspersa-stenophylla Group
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Abstract

1. 1180 packets of the Parmelia conspersa-stenophylla lichen group from 892 localities in North America were examined for type of adnation, presence of apothecia, isidia, secondary laciniae, and pycnidia, and for chemical constituents. 2. Statistical analyses indicated significant association between adnate thalli and presence of isidia. Stictic acid was significantly associated with both adnate thalli and presence of isidia, salacinic with loose thalli. Apothecia, secondary laciniae, and pycnidia were not associated with any characters. 3. The basic morphological combinations were recognized as distinct species as follows, adnate-no isidia. P. conspersa (Ehrh.) Ach; adnate-with isidia: P. isidiata ( Anzi ) Gyel.; loose-no isidia: P. stenophylla (Ach.) Heug.; and loose-with isidia: P. isidiosa (Mull. Arg.) Hale, nov. comb. Each species exists as one to six chemical strains, most of which have definite geographical distributions.

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