KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. NIO 8. 



51 



comp. Nienburg, 1. c). The male frond is, at first, monostromatic, but soon becomes 

 3-stratose, as in Martensia acc. to Svedelius. In this the surface cells become sper- 

 matange mother-cells, while, in G. australe, the frond becomes polystromatic before 

 spermatanges are formed (fig. 28 c — g). In the production of spermatia it seems to 

 follow Martensia. In G. Buffhami Batters the monostromatic frond seems to produce 

 spermatia directly on both sides, to judge from the imperfect figure. 



The female leaflets are polystromatic (fig. 23 a) and carry 1 — 4 cystocarps, seldom 

 more. Fig. 23 b shows a section of a young cystocarp with part of the fusion cell. Låter, 

 the spore-producing filaments become prostrate on the bottom of the chamber, and pore- 



Fig. 24. Pobjcoryne radiata: a tuft of male fronds, X 25; b — C formation of spermatia, X 360; d cross section of 



tetrasporic frond, X 180; e — f formation of tetrasporangia, X 360, 6 cross section, f from a crushed length section. — cc 



central cells, pc pericentral cells, spmc spermatange mother cells, sp spermatia.. 



connections are established with the cells of the central lamella as in Neuroglossimi (fig. 

 23 c — d). Batters' figure shows a cystocarp of the ordinary Nitophyllum-ty-pe. It 

 is possible that this character is of generic value and that G. australe should be made 

 the type of a new genus, but further studies of the cystocarp in the Delesseriaceae are 

 necessary, and the two species of Gonimophyllum from California, mentioned by Set- 

 chell, Parasitism p. 165, have not yet been described. 



The tetrasporic frond (fig. 23 e) does not present any features of special interest. 



