Drepanocladus longifolius

(Wilson ex Mitten) Brotherus ex Paris

Coll. Nom. Broth., 10. 1909.

Basionym: Amblystegium longifolium Wilson ex Mitten J. Linn. Soc., Bot. 12: 571. 1869
Synonyms: Drepanocladus aduncus var. capillifolius (Warnstorf) Riehmer D. capillifolius Janssens D. crassicostatus
Treatment appears in FNA Volume 28. Treatment on page 295. Mentioned on page 293, 296, 401.

Plants medium-sized to large. Stems pinnate or irregularly branched. Stem leaves falcate or rarely almost straight, ovate, triangular, or broadly rounded-triangular, gradually narrowed to apex, concave, 1.5–6.4 × 0.5–1.3 mm; base erectopatent to patent, insertion slightly curved; margins entire or frequently partly finely denticulate; apex long-acuminate, acumen gradually differentiated, in straight-leafed plants ± plane; costa single, excurrent or longly so, rarely ending few cells before apex, strong; alar region transversely triangular or narrowly so, reaching from margin 66–80% distance to costa; ratio of medial laminal cell length (µm) to leaf length (mm) 16.5–23.9(–25.5). Sexual condition dioicous.


Habitat: Mineral-and nutrient-rich habitats, submerged in lakes, pools, ox-bow lakes, water-filled kettle holes, periodically dry pools, small and usually slowly flowing brooks, springs, periodically wet depressions in meadows
Elevation: low to high elevations

Distribution

V28 461-distribution-map.gif

Alta., B.C., Man., N.B., N.W.T., Ont., Que., Sask., Yukon, Alaska, Calif., Colo., Mich., Mont., Oreg., S.Dak., Utah, Wash., Wis., Wyo., South America, Eurasia, Indian Ocean Islands (Kerguelen Islands), Australia.

Discussion

Drepanocladus longifolius differs from all other North American species of Drepanocladus in its excurrent leaf costa; because of this trait, it can hardly be confused with any other taxon of Drepanocladus (in the broad sense) in North America except Sarmentypnum trichophyllum. However, the shoots are radially branched and shoots and branch apices pencil-like in S. trichophyllum, its leaf margins are more strongly denticulate, it frequently becomes red when emergent whereas D. longifolius never is red, and the axillary hairs consist of 2–7 distal cells that are brown when young (1 or 2 hyaline cells in D. longifolius).

Selected References

None.

Lower Taxa

None.
... more about "Drepanocladus longifolius"
Lars Hedenäs +
(Wilson ex Mitten) Brotherus ex Paris +
Amblystegium longifolium +
Alta. +, B.C. +, Man. +, N.B. +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Colo. +, Mich. +, Mont. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wis. +, Wyo. +, South America +, Eurasia +, Indian Ocean Islands (Kerguelen Islands) +  and Australia. +
low to high elevations +
Mineral-and nutrient-rich habitats, submerged in lakes, pools, ox-bow lakes, water-filled kettle holes, periodically dry pools, small and usually slowly flowing brooks, springs, periodically wet depressions in meadows +
Coll. Nom. Broth., +
Drepanocladus aduncus var. capillifolius +, D. capillifolius +  and D. crassicostatus +
Drepanocladus longifolius +
Drepanocladus +
species +