Contributions to the Study of 



Japanese Bryophyta: 



1. on two new Genera of Musci. 



By 

 S. Okaiuura. 



Kochi-ken First Middle School, Tosa. 



With Plates II and III. 



In August 1905, I collected, in the Province of Tosa, 

 a species of moss which resembles Mnium in many respects, 

 and in April of the next year I found another species of moss 

 belonging to the Pleursoarpi. Specimens of these two mosses 

 were sent to Dr. Brotherus of Helsingfors for determination. 

 From these he established two new genera and described them 

 in " Ofversigt af Finska Vetenskaps-Societetens Forhandlingar, 

 XLIX. No. 10 " naming the first mentioned Ortbomniopsis and 

 the other Okamuraea. Since then I have studied carefully the 

 morphology and habits of these interesting mosses. The 

 following descriptions with accompanying plates are published 

 here in the hope that they might supplement the original 

 description of Dr. Brotherus which were made from somewhat 

 incomplete material of my first collection. 



Orthomniopsis japonica Broth, nov. gen. 

 Jap. Name Yamato-Tachkhochingoke. 



On rocks, green, lacking glossiness rather densely caespi- 

 tose. Rhizoid dense on stems and branches, pale brown, 

 often branched, subbifurcate, 1.7-2.5 mm. long, O.Ol-i-0.020 



