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Drummond Moss

Drummondia prorepens Britton 1894

Comprehensive Description

provided by North American Flora
Drummondia prorepens (Hedw.) O. Jennings,
Mosses W. Pa. 116. 1913.
Gymnostomum prorepens Hedw. .Sp. Muse. 35 j. J801. Drummondia clavellata Hook. ; Drummond. Musci Am. 62. 1828.
Plants in thin dense mats, dark green to almost black below; primary stems long, reaching 10 cm or more in length, sending up numerous short (2-10 mm. long), crowded, densely foliate ^u.i M «« rWlv aooressed when dry, erect-spreading when moist, 1-2 mm. long, oblonglanceolate to ovate-lanceolate, acute to narrowly obtuse, concave, carinate, firm, the margins plane or widely inrolled, entire; costa strong, almost percurrent; upper leaf-cells small, the lumen 7-10 /i in diameter, rounded, incrassate; basal cells scarcely different except at the very insertion, where they are often larger and more translucent; in the perichaetial leaves basal cells elongate over a considerable area, becoming rectangular near the insertion; dioicous, the archegonia and antheridia in terminal buds; seta erect, 2-3 mm. long; capsules erect and symmetric, ovoid-globose, about 1-1.3 mm. long; calyptra large, conic, cucullate, without hairs; exothecial cells parenchymatous, thin-walled, irregular, oblong to hexagonal; stomata apparently lacking; operculum conic-rostrate, the beak long, oblique; mouth of the capsule bordered by several rows of small, thick-walled cells; peristome of 16 short teeth (about 60 p long), truncate, smooth, persistent; inner peristome and annulus lacking; spores 60-90 y. in diameter, maturing in spring.
Type locality : Pennsylvania (Muhlenberg) .
Distribution : On the bark of trees ; New England to Ontario, south to Georgia, Alabama, and Missouri; frequent in the northeastern United States.
bibliographic citation
North American flora. vol 15A (1). New York Botanical Garden, New York, NY
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