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BFNA | Family List | BFNA Vol. 2 | Orthotrichaceae | Orthotrichum

Orthotrichum fenestratum Cardot & Thériot, Proc. Wash. Ac. Sc. 4: 310. 16. 1902.

Plants to 12 mm. Stem leaves erect-appressed when dry, ovate-lanceolate to narrowly lanceolate, 2.2--3.2 mm, acute and often cuspidate-apiculate; margins narrowly revolute to below apex, entire; distal laminal cells 9--15 µm wide, 1-stratose, with 1--2 small conical papillae per cell; basal laminal cells narrowly rectangular, grading to subquadrate at margin, nodose. Sexual condition goniautoicous. Seta ± 2 mm. Capsule exserted; urn ovate when moist, ovate-oblong when dry, 1--1.8 mm, smooth to moderately 8-ribbed; stomates superficial; peristome single, rarely double; endostome segments 8, 1 row of cells, papillose-reticulate; exostome teeth 8 splitting to 16, erect to recurved when old, coarsely papillose above, becoming finely papillose to almost smooth near base. Calyptra short-conic, plicate, with few, thick, white hairs. Spores 20--27 µm.

Collected only once, by J. M. Macoun, who did not record the substrate; probably near sea level; Alaska. Endemic to Alaska.

The exostome teeth that are cancellate to the base and fenestrate and perforate only in the distal portion, and the ovate capsule, distinguish this species.


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