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Compilation
Ditrichum flexicaule

18 Images see all

Type? of Cynodontium flexicaule Schwägr. [family DICRANACEAE]
Paratype of Ditrichum fragilicuspis Dixon & Sainsbury [family DITRICHACEAE]
Type? of Leptotrichum infuscatum Stirt. [family DITRICHACEAE]
Type? of Cynodontium flexicaule Schwägr. [family DICRANACEAE]
Syntype of Ditrichum flexicaule Stirt. ex Braithw. var. compactum [family DITRICHACEAE]
Type? of Leptotrichum flexicaule Kindb. ssp. brevifolium [family DITRICHACEAE]
Type of Distichium macounii Müll.Hal. & Kindb. [family DITRICHACEAE]
Syntype of Leptotrichum crispatissimum Müll.Hal. [family DITRICHACEAE]
Type of Distichium macounii Müll.Hal. & Kindb. [family DITRICHACEAE]
Syntype of Cynodontium flexicaule Schwägr. [family DICRANACEAE]
Type? of Dichelyma sinense Müll.Hal. [family FONTINALACEAE]
Holotype of Ditrichum fragilicuspis Dixon & Sainsbury [family DITRICHACEAE]
Type? of Trichostomum flexicaule Bruch & Schimp. var. densum [family POTTIACEAE]
Lectotype of Trichostomum flexicaule Bruch & Schimp. var. densum [family POTTIACEAE]
Lectotype of Leptotrichum crispatissimum Müll.Hal. [family DITRICHACEAE]
Syntype of Leptotrichum infuscatum Stirt. [family DITRICHACEAE]
Type? of Leptotrichum crispatissimum Müll.Hal. [family DITRICHACEAE]
Type? of Leptotrichum flexicaule Kindb. ssp. brevifolium [family DITRICHACEAE]
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Name

Identification
Ditrichum flexicaule (Schwägr.) Hampe [family DITRICHACEAE ] (stored under name); Trichostomum flexicaule Bruch & Schimp. [family POTTIACEAE ] Verified by Anna Arnfinn Frisvoll,
Related name
  • Leptotrichum infuscatum
  • Cynodontium flexicaule
  • Leptotrichum crispatissimum
  • Didymodon flexicaulis
  • Dichelyma sinense
  • Distichium macounii
  • Ditrichum flexicaule
  • Leptotrichum flexicaule
  • Trichostomum flexicaule
  • Ditrichum crispatissimum
  • Ditrichum fragilicuspis

Flora

Entry for Ditrichum flexicaule (Schwägrichen) Hampe [family ]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 27,
Names
Ditrichum flexicaule (Schwägrichen) Hampe [family ], Flora, 50: 182. 1867,
Cynodontium flexicaule Schwägrichen [family ], Sp. Musc. Frond. Suppl., 1(1): 113, plate 29. 1811
Treatment Author(s)
Rodney D. Seppelt
Robert R. Ireland Jr.
Harold Robinson
Information
Plants usually in dense tufts, green to brownish green, dull. Stems 1–4 cm, usually tomentose prox-imally, sometimes only slightly so, ± matted together. Leaves stiff to flexuose, rarely ± falcate, to ca. 3 mm, from an ovate to elongate-ovate, sheathing base contracted rather suddenly to the subula, lamina 1-stratose; margins entire or very weakly denticulate at the apex, often 2-stratose distally on the margins; costa occupying 1/4–1/3 width of the leaf base, ± convex abaxially, in section with weakly defined adaxial and abaxial stereid bands; cells of the subula short-rectangular to elongate-rhomboid, becoming more elongate in the base, cells adjacent to the costa with only weakly nodulose longitudinal walls, narrower towards the margins. Specialized asexual reproduction unknown. Sexual condition dioicous; male plants shorter than female plants. Seta dark red-brown, to 2 cm, ± flexuose. Capsule ± erect, dark brown, cylindric, to 1.5 mm; operculum high- conic to conic-rostrate, 0.7–0.9 mm; peristome teeth 2-fid nearly to the short basal membrane, densely spiculose-papillose, light brown proximally, pale distally, 300–450 µm. Spores 9–12 µm, finely papillose.
Phenology
Capsules seldom produced, mature summer (Jun–Jul).
Altitude range
low to high elevations;
Distribution
GreenlandCentral America (Guatemala)EuropeAsiaPacific Islands (New Guinea, New Zealand).USA AlaskaUSA Colo.USA IdahoUSA Mich.USA Minn.USA Mont.USA Wash.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada Nfld. and Labr.Canada N.W.T.Canada N.S.Canada NunavutCanada Ont.Canada QueCanada Sask.Canada Yukon
Discussion
Ditrichum flexicaule in the broad sense (including D. gracile) is exceedingly variable in morphology, not only in North America (A. J. Grout 1928–1940, vol. 1, part 1; H. A. Crum and L. E. Anderson 1981) but throughout the world (R. D. Seppelt 1982; A. A. Frisvoll 1985). While many workers have treated the variation and the described variant taxa as one highly polymorphic species (Crum and Anderson; M. F. V. Corley et al. 1981), others (Frisvoll; E. Nyholm 1986+, fasc. 1; I. Novotny 1996) have recognized two principal entities, D. flexicaule and D. crispatissimum (= D. crinale (Taylor) Kuntze). We have followed this latter interpretation. A comprehensive molecular analysis of the group would be highly desirable. Crum and Anderson related all variation in habit and microscopic details to environmental conditions, particularly shade and moisture. Frisvoll differentiated two taxa largely on the basis of gametophytic features. Notwithstanding the considerable variability exhibited by these taxa, we also consider them distinct. While often found infertile, D. flexicaule is more commonly found with sporophytes than is D. gracile. Both are calciphiles.

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