Abstract
Elden Mountain, located immediately northeast of Flagstaff in north-central Arizona, is an unusual volcanic peak with a diverse fern flora. The earliest pteridophyte collections from the area are those taken by L. N. Goodding in 1913. Whiting and Bradey collected extensively on the mountain during the 1930's and were apparently the first to encounter Asplenium adiantum-nigrum in 1935. In a short article discussing the occurrence of this species in Arizona, Wherry (1941) mentioned five other ferns casually observed during a visit to the locality. Phillips (1946, 1947) listed five additional taxa for the mountain, bringing the number of reported species to 11. The flora of Elden Mountain received little attention during subsequent years, and much of the area remained unexplored when a forest fire inflicted heavy damage in June, 1976. Concerned about the fate of several rare species, I began a comprehensive survey of surviving fern populations in 1978. Elden Mountain is a massive dacite dome located near the center of the San
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