<4 TASMAXIAN BRYOPHYTA, 



Sub-family Jubuloideae. — Leaves incubous, very un- 

 equally iJ-lobed, ventral lobe small, and more or less 

 jDressed against the larger dorsal lobe, rarely both lobes 

 nearly equal; underleaves usually present. Perianth 

 saccate with a very small often tubular mouth. Capsule 

 not splitting to the base ; many elators attached to the 

 apex of each valve. 



1. Ventral lobe convoluted to form a 



water sack ., Frulhinia 



Ventral lobe an involution on the 

 ventral margin Lejeunia group 



Gymnomitrium Corda. 



Small, growing in dense masses. Leaves imbricate, 

 concave, entire or bifid, apex usually colourless. Under- 

 leaves none. Perianth none; calyptra terminal; capsule 

 globose on a short seta,; upper leaves enlarged, braets 

 smaller and colourless. 



(ji/ivuoinitriuni cnncinnatum {Lightf) Corda. — Stems 

 small, slender, about 5 mm. long, pale green tinged with 

 red or yellow. Leaves closely imbricate in two opposite 

 rows closely appreased to the stem, oblong, 1 mm. mostly 

 \ bilobed, sometimes notched or entire, margin hyaline; 

 cells about 20 /x., cuticle minutely verruculose. Bracts 

 many deeply lobed ; inner ones laciniate. 



Our plant has been referred to Acolia sty g la, but that 

 has entire less crawded leaves. 



Mt. Wellington Plateau. 



Cosmopolitan. 



In exposed situations on mountains the leaves are 

 more closely appressed and entire; marginal cells elongated 

 and irregular, forming an erose colourless border. — Cesia 

 erosa C. ct F. 



Plagiochila, Dum. 



Large to medium, never very small, green or more or 

 less tinged with brown, shoots ascending from a leafless 

 rhizome, simple or more often with lateral branches. 

 Leaves succubous, base narrow, oblique with the dorsal 

 margin reflexed ; underleaves absent. Perianth terminal, 

 with a broad, laterally flattened, bilobed or truncate 

 mouth ; floral leaves large. Antheridia in terminal spikes. 



Plants of the deltoid group vary in habit and stric- 

 ture. It is very difficult to define specific limits, and 

 numerous species have been described from limited her- 

 barium material. In all the species the dentition of the 

 margins and size of trigones vary great.l^^ 



