Pleuroweisieae, sensu Saito, 1975

Cano, María J. & Jiménez, Juan A., 2013, A taxonomic revision of the tribe Pleuroweisieae (Pottiaceae, Bryophyta) in South America, Phytotaxa 143 (1), pp. 1-42 : 4

Key to the genera of the Pleuroweisieae in South America

1. Perichaetia terminal on the stem ................................................................................................................................... 2

- Perichaetia on short lateral branches on the stem ......................................................................................................... 4

2. Leaf margins recurved at least in one side; ventral surface cells of the costa undifferentiated........ 1. Hymenostylium

- Leaf margins plane; ventral surface cells of the costa differentiated ........................................................................... 3

3. Leaf apex obtuse to widely acute....................................................................................................... 2. Gymnostomum

- Leaf apex acute to narrowly acute .......................................................................................................... Tuerckheimia

4. KOH leaf color reaction negative or light yellow; lamina usually with bistratose patches; costa with usually two band of dorsal stereids, and ventral surface cells differentiated or not ..................................................... 3. Molendoa

- KOH leaf color reaction orangish yellow; lamina usually unistratose; costa with one band of dorsal stereids and usually ventral surface cells undifferentiated ..................................................................................... 4. Anoectangium

1. Hymenostylium Brid. (1827: 81) . Type:— Hymenostylium xanthocarpum (Hook.) Bridel (1827: 82) .