Consortium of Bryophyte Herbaria - Gemmabryum caespiticium

Gemmabryum caespiticium (Hedw.) J.R. Spence
Family: Bryaceae dry calcareous bryum moss [Bryum angustifolium Brid., more] Wayne Lampa	Flora of North America Resources John R. Spence in FNA Volume 28 Gemmabryum caespiticium Plants: large. Stems: 0.1–2(–3) cm. Leaves: weakly to moderately concave, 0.5–2(–3) mm; margins plane to strongly revolute, limbidium distinct to weak, of 1 or 2 rows of elongate incrassate cells; apex occasionally hyaline with age; costa short- to long-excurrent, awn brown, yellow-brown, or sometimes hyaline, smooth or rarely somewhat denticulate, 1/4–3/4 leaf length; proximal laminal cells abruptly quadrate to rectangular, 1–2:1 away from costa, 2–4:1 along costa; medial and distal cells long-hexagonal, 12–18(–20) µm wide, (3–)4–6:1. : Specialized asexual reproduction rare, by deciduous brood branchlets in distal leaf axils, and rhizoidal tubers, red, spheric, 100–200 µm, cells smooth. Capsule: with endostome segments pale tan, brown, red-brown, or rarely pale yellow. Spores: 8–14(–16) µm. Phenology: Capsules mature Apr–Aug (spring–summer). Disturbed soil, earth banks, rotten wood, rock, disturbed habitats. low to high elevations (0-4000 m). Greenland, Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Ariz., Ark., Calif., Colo., Conn., Del., D.C., Idaho, Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Mexico (Baja California, Hidalgo), s South America, Europe, Asia, Africa, Atlantic Islands, Pacific Islands, Australia. The combination of small caespitose plants with ovate-lanceolate concave leaves, strong awns, and inflated subalar cells on fertile stems is diagnostic of Gemmabryum caespiticium. The last character is also a diagnostic character of sect. Cladodium of Ptychostomum and known from a few other species in other genera (for example, Bryum dyffryense Holyoak).
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