Studies in Austral Bryaceae (Bryopsida) I. New Combinations in Ptychostomum Hornsch. from southern South America Author Spence, John R. text Phytotaxa 2020 2020-03-25 437 2 60 65 http://dx.doi.org/10.11646/phytotaxa.437.2.2 journal article 6547 10.11646/phytotaxa.437.2.2 027a1916-457b-42c3-8e2f-d98899953c75 1179-3163 5585891 Subgenus Ptychostomum 1. Plants often pink to red, rarely green; spores 18–24 µm ; capsule elongate-clavate, ± straight, peristome well-developed; sexuality dioicous................................................................................................................................................................................. P. pallens - Plants green, yellow-green to brown; spores 12–35 µm , capsule turbinate to clavate, straight or rarely curved, peristome welldeveloped to strongly reduced; sexuality dioicous, autoicous or synoicous ......................................................................................2 2. Autoicous; plants green; leaf with distinct limbidium; spores> 30 µm , capsule elongate-clavate, somewhat curved; peristome reduced, cilia absent ........................................................................................................................................................... P. cernuum - Dioicous or synoicous; plants green to yellow-green or brown; leaf limbidium present or absent; spores < 30 µm ; capsule turbinate to short-clavate, typically not curved, peristome well-developed to strongly reduced ......................................................................3 3. Leaves strongly recurved when wet, with narrow decurrent base; basal most proximal laminal cells somewhat inflated, distinct from cells above; capsule unknown ....................................................................................................................................... P. nivale - Leaves erect but not recurved when wet, base broader, not decurrent; proximal laminal cells not inflated or distinct from cells above; capsules often present .............................................................................................................................................................4 4. Leaf margins plane; sexuality dioicous; spores 12–16 µm , capsule turbinate, cilia present and well-developed ......... P. turbinatum - Leaf margin recurved proximally; sexuality synoicous; spores 22–26 µm , capsule clavate, cilia absent ................... P. mucronatum