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BFNA | Family List | BFNA Vol. 2 | Orthotrichaceae | Drummondia

Drummondia prorepens (Hedwig) E. Britton, Mem Torr. Bot. Cl. 4: 180. 1894.

  • Drummondia canadensis (Macoun & Kindberg)
  • Drummondia clavellata (Hooker & Greville) Hooker
  • Drummondia clavellata var. canadensis Macoun & Kindberg
  • Gymnostomum prorepens Hedwig

    Plants olive, dark green, or yellow-brown. Stem leaves spreading to wide-spreading when moist, broadly-lanceolate to oblong-lanceolate, 1.1--1.8 mm, acute or obtuse, sometimes tips incurved, concave; margins entire; costa ending just below apex, broadly channeled; basal laminal cells similar to distal cells; distal laminal cells 6--10 µm wide; alar cells yellow, ± inflated at marginal insertion. Perichaetial leaves closely clasping seta, basal cells rectangular, usually yellowish, up to 2 mm, broadly-lanceolate, acute or acuminate. Sexual condition autoicous. Seta 2--3.5 mm, dextrose. Capsule ovate to ovate-oblong, 0.9--1.3 mm, wrinkled when old and dry, sharply contracted to seta, not constricted beneath mouth; stomates none; peristome teeth each 3--6 cells high. Spores 70--100 µm in longest dimension, rounded-quadrate to elliptic-rectangular, multicellular, brown, almost smooth.

    Usually on trunks and branches of deciduous trees in dry, upland forest or cedar glades, sometimes on conifers or on logs; N.B., N.S., Ont., Que.; Ala., Ark., Conn., Del., D.C., Ga., Ill., Ind., Iowa, Ky., Kan., Maine, Md., Mass., Mich., Miss., Mo., Neb., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Vt., Va., W.Va. Endemic to eastern North America.

    This species cannot be confused with any other moss. The long-creeping stems with numerous, erect branches bearing terminal sporophytes are characteristic. This habit, combined with the cucullate calyptrae, smooth, ovate capsules with 16, truncate exostome teeth, the lack of stomates, and the undifferentiated basal leaf cells is absolutely diagnostic.


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