DICRANUM BREVIFOLIUM NEW TO THE MOSS FLORA OF MICHIGAN AND THE EASTERN UNITED STATES

摘要

While studying the moss genus Dicranum (Dicranaceae) for the Bryophyte Flora of North America project, I discovered a sterile specimen of D. brevifolium (Lindberg) Lindberg from Michigan in the herbarium of the Smithsonian Institution. It had been misidentified as D. undulatum Bridel, a related and more common species that occurs in bogs in both the Upper and Lower Peninsula of the state (Darlington 1964). The specimen of D. brevifolium, which is from Mar-quette Co. in the Upper Peninsula of Michigan, represents a species that is not only new to the state but is also the first record from the continental United States east of the Mississippi River ( Bellolio-Trucco & Ireland 1990). It is an arctic-alpine species so its occurrence in the Upper Peninsula was not totally unexpected. G.E. Nichols (1935) first commented on the arctic-alpine bryophyte element in the vegetation of the Upper Peninsula, citing such species as Poly-trichastrum alpinum (Hedwig) G.L. Smith (as Polytrichum alpinum Hedwig) and Andreaea rupestris Hedwig (as A. petrophila Ehrhart). Later, W.C. Steere (1937) also discussed the arctic-alpine bryophyte element in the flora of the Upper Peninsula.