Codriophorus ryszardii

Codriophorus ryszardii ranges from Kodiak Island southwards to the Olympic Mountains and Cascade Range of Washington and northern Oregon. The species was recognized as a distinct taxon only recently by Bednarek-Ochyra, who showed that the western North American specimens determined as Racomitrium aquaticum (Schrader) Bridel (W. B. Schofield 1968, 1976; E. Lawton 1971) had nothing to do with that European endemic and represented a new species. Although there are some similarities in the structure of the costa, C. ryszardii is immediately distinct in having lanceolate to linear-lanceolate leaves, 3.2-4 mm. They are narrowly long acuminate and end with an obtuse or subacute apex that is most often bluntly erose-dentate, giving it a cristate appearance, and only seldom is the leaf apex entire. Moreover, its leaf margins are recurved to ³/4-⁷/8 of the leaf length, costae are often bluntly winged abaxially in the distal portion, laminal cells are entirely 1-stratose, and the supra-alar cells are not differentiated from the adjacent laminal cells and do not form basal marginal borders. Additionally, the peristome teeth are longer, 500-650 µm, and they are densely papillose with needle-like papillae. The leaves of C. aquaticus are shorter, 2.5-3 mm, broadly lanceolate and more shortly acuminate into an obtuse and always entire, never erose-dentate or cristate apex. Moreover, the leaf margins are recurved to ¹/2-³/4 of the leaf length, costae are symmetric and never winged abaxially, laminal cells are sometimes 2-stratose distally, the supra-alar cells are quadrate to short-rectangular with relatively thick, smooth to slightly sinuose walls forming short but usually distinct, hyaline to yellowish-hyaline but otherwise pellucid marginal borders, and the peristome teeth are shorter, to 450 µm, and they are only finely papillose.

Plants medium-sized to large, in loose, extensive tufts or mats, dull, green, yellow-brownish or olive to green-brown. Stems (1-)2-7 cm or occasionally up to 10 cm long, prostrate to ascending, irregularly sparsely branched, usually radiculose at base. Leaves lanceolate to linear-lanceolate, (2.8-)3.2-4.0(-4.2) × 0.8-1(-1.1) mm; margins 1-stratose throughout, recurved on both sides to about ³/4-⁷/8 of way up the leaf; apices slenderly long acuminate, obtuse to subacute, irregularly bluntly erose-dentate, cristate to papillose-crenulate, rarely entire at the extreme apex; costa subpercurrent, (80-)90-120(-135) µm wide; laminal cells 1-stratose throughout. Seta brown, (4.5-)5.5-7.5(-9) mm. Capsule brown, cylindric, (2-)2.3-3(-3.2) mm, smooth; peristome teeth 500-650 µm, dark yellow to orange-brown, regularly 2-fid to the base, densely papillose with tall, spiculose papillae. Spores 10-16 µm.

Racomitrium ryszardii Bednarek-Ochyra, Cryptog. Bryol. Lichénol. 21: 276, figs. 1-3. 2000

Codriophorus ryszardii là một loài Rêu trong họ Grimmiaceae. Loài này được (Bednarek-Ochyra) Bednarek-Ochyra & Ochyra mô tả khoa học đầu tiên năm 2003.