Sullivant'S Pleuridium Moss (Pleuridium sullivantii)
Description
Stem leaves appressed, concave, lamina 1-stratose; proximal leaves minute and bract-like, deltoid, acuminate, 0.80-0.85 - 0.35-0.38 mm, entire proximally, serrulate distally; distal stem leaves broadly ovate-lanceolate, 0.85-1.35 - 0.38-0.55 mm, entire proximally, infrequently serrulate distally; costa broad, percurrent. Perichaetial leaves obovate, abruptly subulate with an excurrent tip, 1.2-2.2 - 0.30-0.75 mm, margins entire proximally, erose-serrulate distally especially at shoulder; basal cells loosely rectangular; median cells irregular, subquadrate to short-rectangular to rhomboidal or trapezoidal; distal cells at shoulder shorter, rhomboidal; costa percurrent to excurrent, narrower proximally, widest at shoulder, filling the tip, which is less than 1/4 of the leaf length, 0.25-0.55 mm; transverse section of costa at mid leaf showing adaxial guide cells extending across costa, an extensive abaxial band of stereids, and a few thin-walled accessory cells in the center; innermost perichaetial leaves oblong with an acuminate tip, subpercurrent. Sexual condition paroicous, antheridia naked in the stem leaf axils. Seta 0.2-0.25 mm. Spores (23-)27-33 -m, densely and finely papillose-spinulose, light orange-brown in mass.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Bryophyta
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Class: Bryopsida
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Order: Dicranales
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Family: Ditrichaceae
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Genus: Pleuridium
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