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Tortula leucostoma (R. Brown) Hooker & Greville [family ]

Date Updated: 23 July 2012

Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 27,
Names
Tortula leucostoma (R. Brown) Hooker & Greville [family ], Edinburgh J. Sci., 1: 294. 1824, Barbula leucostoma R. Brown [family ], Chlor. Melvill., 40. 1823 Desmatodon leucostoma (R. Brown) Berggren [family ] Desmatodon suberectus (Hooker) Limpricht [family ] Tortula suberecta Hooker [family ]
Treatment Author(s)
Richard H. Zander Patricia M. Eckel
Information
Leaves ovate-lanceolate or occasionally ovate, apex broadly acute or rounded-acute, piliferous, margins recurved in middle 2/3 of leaf or more, not or weakly bordered distally with ca. 2 rows of less papillose, thicker-walled cells, to ca. 2:1; costa long-excurrent, lacking an adaxial pad of cells, distally narrow, 2–3 cells across the convex adaxial surface; distal laminal cells hexagonal, 13–20 µm wide, 1:1, densely papillose with several 2-fid papillae. Sexual condition autoicous or paroicous. Sporophytes exerted. Seta 0.4–1.9 cm. Capsule stegocarpic, short-cylindric, erect and nearly straight, urn 1.5–2 mm; peristome 300–500 length µm, teeth 16, divided to near the base or perforate basally, the teeth often basally fused into a low basal membrane ca. 50 µm; operculum 0.5–0.6 mm. Spores ca. 23–25 µm, spheric, densely papillose.
Phenology
Capsules mature summer.
Altitude range
low to high elevations (0–3700 m);
Distribution
GreenlandEuropeAsia.USA AlaskaUSA Ariz.USA Calif.USA Colo.USA Mont.USA Wash.Canada B.C.Canada Nfld. and Labr.Canada N.W.T.Canada NunavutCanada Yukon
Discussion
Tortula leucostoma and T. guepinii were considered by W. C. Steere (1939c) to be probably subspecies of T. hoppeana (as Desmatodon latifolius). This species differs from T. hoppeana largely by the tapering leaf with piliferous costa, and perhaps the somewhat shorter seta.

Date Updated: 23 July 2012

Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 27,
Names
Tortula leucostoma (R. Brown) Hooker & Greville [family ], Edinburgh J. Sci., 1: 294. 1824, Barbula leucostoma R. Brown [family ], Chlor. Melvill., 40. 1823 Desmatodon leucostoma (R. Brown) Berggren [family ] Desmatodon suberectus (Hooker) Limpricht [family ] Tortula suberecta Hooker [family ]
Treatment Author(s)
Richard H. Zander Patricia M. Eckel
Information
Leaves ovate-lanceolate or occasionally ovate, apex broadly acute or rounded-acute, piliferous, margins recurved in middle 2/3 of leaf or more, not or weakly bordered distally with ca. 2 rows of less papillose, thicker-walled cells, to ca. 2:1; costa long-excurrent, lacking an adaxial pad of cells, distally narrow, 2–3 cells across the convex adaxial surface; distal laminal cells hexagonal, 13–20 µm wide, 1:1, densely papillose with several 2-fid papillae. Sexual condition autoicous or paroicous. Sporophytes exerted. Seta 0.4–1.9 cm. Capsule stegocarpic, short-cylindric, erect and nearly straight, urn 1.5–2 mm; peristome 300–500 length µm, teeth 16, divided to near the base or perforate basally, the teeth often basally fused into a low basal membrane ca. 50 µm; operculum 0.5–0.6 mm. Spores ca. 23–25 µm, spheric, densely papillose.
Phenology
Capsules mature summer.
Altitude range
low to high elevations (0–3700 m);
Distribution
GreenlandEuropeAsia.USA AlaskaUSA Ariz.USA Calif.USA Colo.USA Mont.USA Wash.Canada B.C.Canada Nfld. and Labr.Canada N.W.T.Canada NunavutCanada Yukon
Discussion
Tortula leucostoma and T. guepinii were considered by W. C. Steere (1939c) to be probably subspecies of T. hoppeana (as Desmatodon latifolius). This species differs from T. hoppeana largely by the tapering leaf with piliferous costa, and perhaps the somewhat shorter seta.
Tortula leucostoma (R. Brown) Hooker & Greville [family ]
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