Drummondia prorepens
Drummond moss
leaves channeled, concave, 1.1–1.8 mm;
apex sometimes incurved;
costa broadly channeled;
alar cells yellow, ± inflated at marginal insertion;
basal laminal cells 6–10 µm.
dextrorse.
0.9–1.3 mm, sharply contracted to seta, neck absent;
exostome teeth 3–6 cells high, rudimentary, truncate.
rounded-quadrate to elliptic-rectangular, 70–100 µm in longest dimension, almost smooth, brown.
leaves closely clasping seta, broadly lanceolate, to 2 mm, apex acute or acuminate, basal laminal cells rectangular, yellowish green.
Drummondia prorepens
Drummondia prorepens is characterized by long, creeping stems with many erect branches bearing terminal sporophytes. This habit, combined with the cucullate calyptrae, the smooth, ovate capsules with 16 truncate exostome teeth, the lack of stomata, and the undifferentiated basal laminal cells, is absolutely diagnostic.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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