Orthotrichum garretti

Orthotrichum garretti Grout & Flowers; Grout,
Moss Fl. N. Am. 2: 128. 1935.
Plants in thin, dark green cushions, 1 cm. high or less; leaves loosely imbricate and somewhat contorted when dry, broadly lanceolate, broadest a little above the base, concave, often bearing numerous septate brood-bodies, the apices slenderly acute to acuminate, often serrulate and tipped with one or more hyaline elongate cells, very brittle and often broken off, the upper leaves reaching 2.7 mm. in length, the mar gins re volute nearly to the apex; costa strong, ending below the apex; upper leaf-cells strongly papillose, the papillae rather broad and low, or sharp and salient near the apex, rounded and nearly isodiametric, 10-20 fi in diameter, the walls thin for the genus, densely chlorophyllose, the basal cells short-oblong-rectangular, quadrate on the margins; antheridia not seen; seta 0.5 mm. long; capsules emergent, short-oblong, including the conic-apiculate operculum about 2 mm. long, 8-ribbed, the neck about the length of the seta; calyptra campanulate, bearing a, few short hairs near the apex; stomata immersed; peristome-teeth 16, short, about 0.18 mm. long, finely papillose, more or less united in pairs at first, often narrowly perforate above, the segments of 2 rows of cells, nearly or quite as long as the teeth, rather sparingly papillose, appendiculate with several very long processes reaching half-way or more to the next segment; spores maturing in spring.
TypB locality: On sandstone, Emma Park, Carbon County, Utah (Flowers 834).
Distribution: Utah; near Columbus, Ohio; Lake Rupert, Canada (Lepage).