166 



JUNGERMANNIA STYGIA, HOOK, F. ET TAYL. 



By Wm. Hy. Pearson, M.Sc, A.L.S., 



Plate XXIII. 



(Read 19th September, 1921.) 



In Mr. Rodway's interesting and useful List of Tas- 

 manian Hepatics (Proc. Royal Sec. Tasm., p. 74, 1916) refer- 

 ence is made to this species, and also to Cesia erosa, Carr. et 

 Pears. 



The following notes will clear up some misunderstanding 

 with reference to these species. 



In Hooker's Flora Antarctica, Jungerinannia stygia is 

 described and figured as follows: — "Perpusilla, caule erecti, 

 "laxe caespitoso ramoso, foliis erectis, subimbricatis, 

 "appressis, obovatis, integris v. emarginatis, perichaetiis 

 "rotundatis, caule duplo latioribus. (Tab. LXIL, Fig. IV.) 



"Hab. Campbell's Island, on rocks on the hills, growing 

 "amongst other Hepaticae and Mosses. 



"Caules 2-3 lin. longi, crassiusculi, superne fusco v. atro- 

 "purpurei, inferne fusco-olivacei, vage ramosi; ramis divari- 

 "catis. Folia minima, subsecunda, alterna, vix imbricata 

 "obovata v. oblonga, apices versus obtusos late emarginata, 

 "segmentis obtusis, rarius integra, margine superiore inter- 

 "dum scariosa. Perichaetia subrotunda, foliis imbricatis, 

 "latiusculis, ad apices albidos, pleurumque scariosis. 



"A very inconspicuous little species approaching J, con- 

 "cinnata (Lightf.), of which it is probably the representative 

 "in these islands; the leaves are, however, more distant, never 

 "bifid at the apex, the stem slenderer, and the perichaetia 

 "sessile and round. Its colour is like Gymnomitrium adustum, 

 "Nees, a German plant, with short and simpler stems." 



In the Manchester Museum there is an original specimen 

 of Jung, stygia from Campbell's Islands, and I have had the 

 opportunity of microscopically examining the same; it is 

 composed of two quite different species, one, which is figured 

 by Hooker, being a round-leaved species, probably a Jameson- 

 iella, and a Gymnomitrium, which it would be difficult to dis- 

 tinguish from Gym. concinnatum (Lightf.). Evidently the 

 two species have been described as one, but with Hooker's 



