A New Combination in Pottia (Musci)

1 Pages·1993·0.36 MB·English

by  Richard Zander

A New Combination in Pottia (Musci)
Richard Zander
Buffalo Museum of Science, 1020 Humboldt Parkway, Buffalo, New York 14211, U.S.A.
Abstract. Pottia fosbergii, of the southwestern bergii should henceforth be recognized at the va¬
United States and Mexico, is recognized at the va¬ rietal level, as it differs from P. starkeana only in
rietal level: P. starkeana var. fosbergii. the operculum weakly differentiated or not differ¬
entiated, and the peristome absent or rudimentary.
While working on tlie genus Pottia for the forth¬
coming Moss Flora of Mexico (Sharp et al., in press), Pottia starkeana var. fosbergii (E. B. Bartram)
I found that plants referable to Pottia fosbergii E. R. H. Zander, comb, et stat. nov. Basionym:
B. Bartram usually occur in mixture with P. starke¬ Pottia fosbergii E. B. Bartram, Bryologist 33:
ana (Hedwig) C. Muller subsp. starkeana and may 18. 1930. TYPE: U.S.A. California: Los An¬
actually be hybrids between P. starkeana and an¬ geles Co., Claremont, Fosberg 1)24 (holotype,
other species. The operculum is usually undiffer¬ FH).
entiated and the peristome absent, hut a Californian
specimen that is clearly P. fosbergii (Ikenberry 369, Literature Cited
CANM), called to my attention by Terry McIntosh,
Sharp, A., H. Crum & P. Eckel (editors). Moss Flora of
has a weakly differentiated operculum and rudi¬ Mexico. New York Bot. Gard., Bronx, New York (in
mentary peristome teeth. The gametophytes of both press).
the above taxa are essentially identical. Pottia fos¬
Volume 3, Number 1, pp. 1-92 of NOVON was published on 19 March 1993.