Amblystegium longicuspis Lindberg & Arnell, Kongl. Svenska Vetensk. Acad. Handl., n. s. 23(10): 123. 1890

Plants medium-sized, golden brown. Stems erect or creeping, unbranched or irregularly branched; paraphyllia absent. Stem leaves erect to spreading, <± suddenly or more gradually narrowed to apex, concave or strongly so>, 2.1-4.6 × 0.6-1 mm; base subsheathing, ovate or narrowly so; acumen frequently differentiated, constituting 18-33% leaf length. Sexual condition autoicous.

Peaty shallow soil over limestone; low elevations; Greenland; arctic Eurasia; c Asia.

Campylium longicuspis is known from a single arctic North American locality in northeast Greenland. The species is easily distinguished from C. stellatum by its ovate or narrowly ovate, rather than cordate or rounded-triangular stem leaves, and shorter leaf acumen, as well as by its autoicous rather than dioicous sexual condition. The stem leaves are straight or slightly homomallous. Differences between 1. C. laxifolium and C. longicuspis are discussed with the former. This species is very rare, and possibly overlooked in the Arctic.

SELECTED REFERENCE Hedenas, L. 1989c. Amblystegium longicuspis Lindb. & H. Arn., its status and taxonomic position. Lindbergia 14: 142-146.