Microbryum davallianum var. davallianum

Synonyms: Pottia starckeana subsp. minutulum (Schwägrichen) D. P. Chamberlain
Treatment appears in FNA Volume 27. Treatment on page 630.

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.).


Phenology: Capsules mature late summer to early winter (Sept-Nov).
Habitat: Bare soil, vacant lots, fields
Elevation: low to moderate elevations

Distribution

V27 925-distribution-map.gif

Ont., Mich., N.Y., Europe, sw Asia, n Africa, Pacific Islands (New Zealand).

Discussion

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.

Selected References

None.

Lower Taxa

None.
Richard H. Zander +
(Smith) R. H. Zander +
Gymnostomum davallianum +
Ont. +, Mich. +, N.Y. +, Europe +, sw Asia +, n Africa +  and Pacific Islands (New Zealand). +
low to moderate elevations +
Bare soil, vacant lots, fields +
Capsules mature late summer to early winter (Sept-Nov). +
Bull. Buffalo Soc. Nat. Sci. +
Pottia starckeana subsp. minutulum +
Microbryum davallianum var. davallianum +
Microbryum davallianum +
variety +