Syn. Musc. Eur. ed. 2,
North America, Europe, Asia (China, Middle East), Africa.
Species 6 (1 in the flora).
Gyroweisia species have ligulate leaves with subpercurrent costae and enlarged, hyaline basal cells, a vesiculose annulus, and peristome absent or rudimentary peristome. Gyroweisia differs from the similar Gymnostomum by the occasional presence of a rudimentary peristome (outside the flora area), the large annulus, sterile plants distinctly smaller than the sporophyte-bearing gametophytes, basal leaf cells differentiated more strongly (often in the basal 1/4 to 1/2), and the more common presence of gemmae.
Gyroweisia pusilla (Kindberg) Brotherus
This entity was treated as a synonym of Gymnostomum calcareum by A. L. Andrews (1922b).
Gyroweisia reflexa (Bridel) Schimper
This is a peristomate species known for the flora area previously only from a single collection in Grey County, Owen Sound, Ontario (Moxley s.n., May 1924, CANM). The specimen is indeed that, but H. A. Crum and L. E. Anderson (1981) questioned the report, suggesting a confusion of specimens by Moxley (as reviewed by W. R. Manierre 1998). The region of the original station, now built over, has been examined by others, but no additional sites discovered. The Michigan collection (MO) reported by Manierre is Tortula obtusifolia (Schwägrichen) Mathieu, which, though similar in the ligulate leaves and rudimentary peristome, differs significantly in the crowded, short-ovate leaves, and the single stereid band and enlarged adaxial superficial cells of the costa in section. Although it would be difficult to demonstrate the absence of this species, given the circumstances it is now appropriate to consider it absent from the New World.
Mogensen, G. S. and R. H. Zander. 1999. Four moss species new to Greenland: Barbula amplexifolia, Didymodon brachyphyllus, D. michiganensis, and Gyroweisia tenuis (Pottiaceae, Musci). Lindbergia 24: 77–83.
|Author||Richard H. Zander +|
|Basionyms||Pottiaceae tribe Barbuleae +|
|Distribution||North America +, Europe +, Asia (China +, Middle East) + and Africa. +|
|Etymology||Greek gyrus, circle, and genus Weissia, alluding to resemblance and well-developed, persistent annulus +|
|Illustration copyright||Flora of North America Association +|
|Illustrator||Patricia M. Eckel +|
|Publication title||Syn. Musc. Eur. ed. +|
|Reference||andrews1922a +, conard1945a +, manierre1998a +, mogensen1999a + and steere1939a +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V27/V27 752.xml +|
|Taxon family||Pottiaceae +|
|Taxon name||Gyroweisia +|
|Taxon parent||Pottiaceae subfam. Barbuloideae +|
|Taxon rank||genus +|
|Volume||Volume 27 +|