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

2a. Microbryum davallianum (Smith) R. H. Zander var. davallianum

Pottia starckeana subsp. minutulum (Schwägrichen) D. P. Chamberlain

Capsule commonly wide-mouthed when dehisced, with a single row of thickened cells below mouth; peristome absent. Spores spiculose (finely spinose) and large (31-39 µm.).

Capsules mature late summer to early winter (Sept-Nov). Bare soil, vacant lots, fields; low to moderate elevations; Ont.; Mich., N.Y.; Europe; sw Asia; n Africa; Pacific Islands (New Zealand).

In var. davallianum the spines of the spores are 2-2.5 µm. Distal laminal papillae are hollow or occasionally solid, ca. 2 per lumen, usually simple but in some specimens (e.g., Ontario, Bruce County, C. Williams 1200, CANM) mostly 2-fid and hollow (with a distinct saddle between the projections) and distinctly C-shaped in optical section.


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