Grimmia donniana Sm.
Annotated by Roxy Hastings and Dan Norris, 17 Jan 2007. Remarks: See notes included in packet from Roxy Hastings. Sterile state, need a sporophyte to be absolutely certain of G. donniana. Supporting G. donniana area the definitive long rectangular, thin-walled outer basal cells that are wide hyaline and the always,2-stratose distal cells. Also the margins are always plane. Annotate as cf.

Oregon: Jackson: Rogue River-Siskiyou National Forest, High Cascades Ranger District, Mt. McLoughlin. Elev. 9500 ft
42.444636° N, 122.316259° W,
Datum: NAD83.
Dry when found, but covered with snow much of the year., partially shaded rock face, Mountain top, slope: 100%, aspect: 360?; Exposed mountain summit. Https://oregonflora.org/collections/individual/index.php?occid=4936440.

Scot Loring 3891SL, 15-Sep-06
OSC, Catalog: OSC-B-27292