Rhabdoweisia crispata Lindberg 1871

In eastern North America, Rhabdoweisia crispata exhibits a wide distribution from the coast to more continental areas, but on the Pacific coast it is primarily in near-coastal oceanic climates. It is distinguished from R. crenulata mainly on the basis of leaf shape: narrowly lanceolate and gradually acute in the former, lingulate and broadly acute to obtuse in the latter. The distal leaf cells of R. crispata are rapidly rehydrated, and generally subquadrate and broader than long while those of R. crenulata are slowly rehydrated, remaining somewhat collapsed until hydrated, and are quadrate to hexagonal. The leaves of R. crispata are serrulate with small teeth, while R. crenulata has dentate leaves with larger, widely spaced teeth.

Plants minute to small, 2–5 mm high, green to bright yellowish green, in tufts. Stems erect, simple or sparsely branched, somewhat radiculose below; central strand present. Leaves 1.8–2.8 mm × 0.25–0.35 mm, strongly crispate when dry, flexuose spreading when moist, narrowly lanceolate to linear-lingulate, leaf base clearly narrower, the upper part rather abruptly narrower from the middle, narrowly acute at the apex; margins plane or slightly recurved in the lower half, entire or serrulate near the apex; costa strong, percurrent; upper cells rounded quadrate to hexagonal, 9–14 µm wide, somewhat thick-walled and slightly mammillose; basal cells rectangular, 26–39 µm × 10–12 µm, lax and hyaline, thin-walled. Perichaetial leaves similar to the upper stem leaves. Setae slender, straight, 2–3 mm long, yellowish; capsules ovoid, 0.5–1.0 mm long, clearly 8-ribbed when dry; annuli none; peristome teeth linear-lanceolate, nearly smooth. Spores 13–18 µm in diameter, brownish, warty.

Plants 0.5-1 cm, occasionally taller. Leaves 2-3.5 mm, crisped when dry, narrowly lanceolate, gradually tapering to an acute apex, margins serrulate with small teeth distally, distal cells subquadrate, 10-14 µm wide, often wider than long, somewhat incrassate. Seta 2-4.5 mm. Capsule 0.7-1 mm; peristome teeth linear to linear-lanceolate, broadened at base, smooth to striolate, perforate or irregular. Spores 15-21 µm.

Distribution: China, Indonesia, Japan, Russia, Europe, Greenland, and North America.

Habitat: on rocks or soil over rocks.

Weissia denticulata Brid., Muscol. Recent. Suppl. 1: 108. 1806, hom. illeg. Weissia fugax Hedw. var. denticulata Hartm., Handb. Skand. Fl. (ed. 3): 273. 1838. Rhabdoweisia denticulata Bruch & Schimp. in B.S.G., Bryol. Eur. 1: 99. 1846, nom. illeg. incl. spec. prior. Weissia fugax var. subdenticulata Boul., Musc. France 543. 1884. Rhabdoweisia fugax (Hedw.) B.S.G. var. subdenticulata (Boul.) Limpr., Laubm. Deutschl. 1: 275. 1886. Rhabdoweisia striata (Schrad.) Lindb. var. subdenticulata (Boul.) I. Hagen, Kongel. Norske Vidensk. Selsk. Skr. (Trondheim) 1914(1): 18. 1915. Rhabdoweisia kuzenevae Broth. in Fedtschenko, Flora Asiae Rossicae. 58–60. 1914.

Bryum crispatum Dickson ex Withering, Syst. Arr. Brit. Pl. ed. 4, 3: 816. 1801; Rhabdoweisia denticulata (Bridel) Bruch, Schimper & W. Gümbel

Rhabdoweisia crispata

Rhabdoweisia crispata (With.) Lindb., Act. Soc. Sc. Fenn. 10:22, 1871.

Bryum crispatum Dicks. ex With., Syst. Arr. Brit. Pl. ed. 4, 3:816, 1801. [Original material: Scotland, coll. Griffith.]

Weisia denticulata Brid., Sp. Musc. 1:108, 1806, nom, illeg. incl. sp. prior. [Original material: Germany, coll. Ludwig.]

Rhabdoweisia denticulata B.S.G., Bryol. Eur. 1:99, 1846.

Rhabdoweisia kusenevae Broth., Trav. Mus. Bot. Ac. Sc. Petrograd 16:19, 1916. [Original material: Amur, Siberia, coll. Kusenevar, July 1915 (H).]

Rhabdoweisia gymnostomioides Dix. & Thér. in Dix., Rev. Bryol. et Lichén. 13:10, 1942. [Original material: Mt. Sirane, Prov. Simozuke, Japan, coll. Sasaoka n. 4450, July 1927 (BM).]

Rhabdoweisia sinensis Chen. Feddes Rep. 58:23–24, 1955. [Original material: Ching-ding, Omei-schan, Szetschwan, China, coll. Chen, n. 5616, Aug. 1942.]

Stems usually less than 1 cm high. Leaves lingulate to linear-lanceolate, 2.0–3.5 mm long, apex acute; margins serrulate to entire; upper lamina cells 9–15 μm in diameter, walls somewhat thickened; basal cells thin-walled, 10 μm wide, to 60 μm long. Setae 2–5 mm long, very slender. Capsule urn narrowly cylindrical, ca. 0.7 mm long; peristome teeth linear-lanceolate, obliquely striate to smooth on surface. Spores ca. 15 μm in diameter.

MAS AFUERA: Q. Blindado, 440 m, Sk. 478 (S).

MAS A TIERRA: Salsipuedes, 464 m, Sk. 58 (S); Q. Damajuana, 345 m, Sk. 77 (S); Wand Damajuana, 500–550 m, K. 315/2b (B), K. 317/17b (S).

The species occurs in Europe, eastern North America, Alaska, Mexico, Hawaii, Japan, Korea, Amur, China, Java, and Bolivia in addition to Juan Fernandez. The early collections from Juan Fernandez were determined as Amphidium, but Lawton (1961) does report R. fugax (Hedw.) B.S.G. from the island on the basis of a Mosely collection from the 1875 Challenger Expedition. Material that I have seen from the islands shows mixed characters. The leaves are like those described for R. fugax and must be the basis for the Lawton determination. Still, I have given greater emphasis to the broader, striated peristome teeth that are characteristic of R. crispata (= R. denticulata).

Rhabdoweisia crispata (Gekräuseltes Streifenperlmoos) ist eine Laubmoos-Art aus der Familie Oncophoraceae.

Rhabdoweisia crispata là một loài rêu trong họ Rhabdoweisiaceae. Loài này được (Dicks. ex With.) Lindb. mô tả khoa học đầu tiên năm 1871.

微齿粗石藓（学名：Rhabdoweisia crispata）为曲尾藓科粗石藓属下的一个种。