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FNA | Family List | FNA Vol. 27 | Pottiaceae | Microbryum

2. Microbryum davallianum (Smith) R. H. Zander, Bull. Buffalo Soc. Nat. Sci. 32: 240. 1993.

Gymnostomum davallianum Smith, Ann. Bot. (König & Sims) 1: 577. 1805; Pottia davalliana (Smith) C. Jensen

Distal laminal cells weakly convex superficially, adaxial surface of costa not mammillose. Seta elongate. Capsule cylindrical, stegocarpous but never cleisto-carpous. Spores granulose, low-papillose or spiculose, large, 28-39 µm.

Varieties 3 (3 in the flora): North America, Mexico, Europe, sw Asia, Africa, Pacific Islands (New Zealand).

1 Capsules commonly wide-mouthed when dehisced, with a single row of thickened cells below mouth, peristome absent, spores spiculose, 31-39 µm.   2a Microbryum davallianum var. davallianum
+ Capsules narrow mouthed when dehisced, with usually 2 or more rows of thickened cells below mouth, peristome variously absent or present, spores merely papillose, 27-34 µm   (2)
2 (1) Peristome well developed   2b Microbryum davallianum var. commutatum
+ Peristome rudimentary or absent   2c Microbryum davallianum var. conicum

Lower Taxa


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