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FNA | Family List | FNA Vol. 28 | Mielichhoferiaceae | Pohlia

29. Pohlia melanodon (Bridel) A. J. Shaw, Bryologist. 84: 506. 1982.

Bryum melanodon Bridel, Bryol. Univ. 1: 845. 1827; B. carneum Withering; B. delicatulum Hedwig

Plants small, dark green, not glossy. Stems 0.3-1 cm. Leaves erect-spreading to spreading, lanceolate to ovate-lanceolate, 0.7-1.3 mm; ; margins weakly serrulate in distal 1/3; apex acute or short-acuminate; costa ending well before apex; distal medial laminal cells laxly and broadly rhomboidal, 60-100 µm, walls thin. Specialized asexual reproduction absent. Sexual condition dioicous; perigonial leaves ovate; perichaetial leaves scarcely differentiated, lanceolate. Seta orange-brown. Capsule inclined ± 180°, brown to red-brown, sometimes stramineous, short-pyriform to urceolate, neck less than 1/3 urn length; exothecial cells isodiametric, walls sinuate; stomata immersed; annulus absent; operculum short- to long-conic; exostome teeth dark brown to red-brown, triangular-acute; endostome yellow to yellow-brown, basal membrane 1/2 exostome length or slightly longer, segments , distinctly keeled, broadly perforate, cilia long, nodulose. Spores 13-18 µm, finely roughened.

Capsules mature spring (Apr-Jun). Disturbed clay or rarely sandy soil, path banks, along streams; low elevations; Ont.; Ark., Ill, Ind., Maine, Md., Mich., N.Y., N.C., Vt., Va., W. Va.; Europe.

Pohlia melanodon has soft, dark green, rather broad ovate-lanceolate leaves with lax, thin-walled cells. The species does not produce elongate sterile cushions as does P. wahlenbergii; even when sterile, the plants have short stems and are rather densely leafy. Pohlia melanodon is more common in eastern North America than collections indicate; it is often sterile and for that reason rarely collected. The exothecial cell walls of capsules of this species are somewhat collenchymatous.


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