3. Atractylocarpus Mitt. Journ. Linn. Soc. London Bot. 12: 71. 1869.

Differing from Campylopus mainly in the linear, upper leaf cells and the straight seta and capsule.

Type species: A. mexicanus Mitt.

Atractylocarpus longisetus (Hook.) Bartr. Bryologist 49: 110. 1946.

Dicranum longisetum Hook. Musci Exot. 139. 1819.

Type specimen: Humboldt & Bonpland, Colombia (K).

This species has been collected once by McConnell & Quelch on Mount Roraima, British Guiana (343, K). The long, erect seta and the linear, upper leaf cells separate it well from other Guiana Dicranaceae . No. 344 has been described as var. laxifolium Broth. ( Dicranum longisetum var. laxifolium Broth. Trans. Linn. Soc. London Bot. ser. 2.6: 88. 1901) but the differences: laxly foliate stems with leaves more strongly senate near apex, do not seem sufficient to warrant its segregation.