Jaffueliobryum raui (Austin) Thér.

  • Authority

    Buck, William R. 1987. Bryostephane Steereana: A Collection of Bryological Papers Presented to William Campbell Steere On The Occasion of His 80th Birthday. Mem. New York Bot. Gard. 45: 1-749.

  • Family

    Grimmiaceae

  • Scientific Name

    Jaffueliobryum raui (Austin) Thér.

  • Etymology

    In honor of the North American bryologist Eugene Abraham Rau (1848-1932).

  • Description

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    Species Description - Plants small, in dense cushions, yellowish-green to somewhat dark green, often hoary in appearance. Stems mostly 5-15 mm tall, branches few; in cross-section outer 1-2 layers thick-walled, reddish-orange, inner cortex of larger hyaline cells, central strand present. Leaves crowded, when dry appressed to erect, lower leaves spreading to squarrose-recurved, when wet erectspreading, keeled distally, oval-obovate, 0.7-1.1 mm long (excluding awn—(0.3-)0.4-0.8(-1.3) mm), 0.45-0.65 mm wide (Fig. 17), unistratose to rarely bistratose in 1-2 bands, acuminate-acute, slightly sheathing stem at base; margin entire to erose distally, often hyaline, occasionally bistratose distally; costa pronounced abaxially, extending as a long excunent awn, in cross-section adaxial and abaxial epidermal cells sunounding 1-2 layers of stereid cells; median cells isodiametric to oval, (5-)10(-18) µm long, upper cells toward junction with costa and margin elongate-oval to rhomboidal, lower and basal cells short or rarely long rectangular to quadrate, 15-40 µm long, 10-18 µm wide, somewhat thick-walled, often appearing lax. Autoicous. Perigonia lateral and below perichaetia; leaves ovate-oblong, to 0.75 mm long, acute-rounded, costa percunent to ending below apex, antheridia few. Perichaetia terminal; leaves similar in shape to stem leaves but larger, to 1.5 mm long (awn to 1 mm long), to 0.65 mm wide. Setae short, (0.35-)0.40-0.45 mm long; capsules ovoid, 0.90-0.95 mm long; exothecial cells irregularly rectangular, walls somewhat thickened; stomata phaneropore, several on lower 1/4 of capsule; annulus of 2-3 rows of cells, 10-35 µm tall, rusty-orange; peristome rusty-orange, highly perforated, long triangular, 190-220 µm long, tips often broken, spiculate (Figs. 4, 5); operculum short rostrate, 0.50-0.55 mm long. Calyptra mitrate, lobed below, plicate, 1.1-1.3 mm long (Fig. 19). Spores 8-10 µm in diameter (Fig. 7).

  • Discussion

    Figs. 4, 5, 7, 16-19.

    Grimmia raui Austin, Bull. Torrey Bot. Club 6: 46. 1875; Coscinodon raui (Austin) Lesquereux & James, Man. Moss. N. Amer. 155. 1884; Grimmia wrightii (Sullivant in Gray) Austin var. raui (Austin) Habeeb, Rhodora 52: 75. 1950. Type: UNITED STATES. Colorado: Dr. Brandegee 28 (comm. Rau) (lectotype NY!).

    Coscindon renauldii Cardot in Renauld & Cardot, Bot. Gaz. 15:41.1890. Type: UNITED STATES. Kansas: Saline County, J. Henry s.n. (lectotype PC!, isolectotype FH!).

  • Distribution

    Ecology and distribution. In mesic to more often xeric vegetation of grasslands and open deciduous (i.e., scrub oak) or conifer (i.e., piiion juniper or ponderosa pine) or mixed woodlands; usually found on sedimentary, mainly sandstone, boulders and rocks, less often on limestone rock, very rarely on sandy soil. Southeastem Alberta, eastem Montana to westem North Dakota south to Texas, disjunct to Driftless Area of southwest Wisconsin, southeastem Minnesota and northeastern Iowa, and from Utah s

    United States of America North America| Canada North America|