Didymodon rigidulus var. ditrichoides

(Brotherus) R. H. Zander

Phytologia 41: 20. 1978,.

Basionym: Barbula ditrichoides Sitzungsber. Akad. Wiss. Wien, Math.-Naturwiss. Kl., Abt. 1, 133: 566. 1924
Synonyms: Didymodon acutus var. ditrichoides (Brotherus) R. H. Zander
Treatment appears in FNA Volume 27. Treatment on page 544. Mentioned on page 545, 558.

Stem leaves strongly appressed when dry, linear-lanceolate, base broadened, ovate to oblong; costa long-excurrent, sharp; proximal cells short-rectangular; distal laminal cells smooth, quadrate to short-rectangular, with quadrate to short-rectangular lumens, distal lamina 1-stratose; gemmae absent. Peristome not seen.


Habitat: Limestone outcrops, dry tundra
Elevation: moderate elevations (1200 m)

Distribution

V27 778-distribution-map.gif

N.W.T., Asia (China), Atlantic Islands (Iceland).

Discussion

Variety ditrichoides is a highly reduced, flagellate form of var. icmadophilus but with a distinctive appearance. It is disjunct from montane China (Chen P. C. 1941) to a single locality in the flora area (Northwest Territories, Mackenzie District, Nahanni Range, 61º43’N, 123º20’W, D. Vitt, 1977, BUF). The olive coloration and general appearance is similar to D. leskeoides but the plant is somewhat smaller and the alar auricles are lacking.

Selected References

None.

Lower Taxa

None.
Richard H. Zander +
(Brotherus) R. H. Zander +
Barbula ditrichoides +
N.W.T. +, Asia (China) +  and Atlantic Islands (Iceland). +
moderate elevations (1200 m) +
Limestone outcrops, dry tundra +
Didymodon acutus var. ditrichoides +
Didymodon rigidulus var. ditrichoides +
Didymodon rigidulus +
variety +