30 



CARL SKOTTSBERG, MARINE ALG^ 2. RHODOPHYCEiE. 



But Chauvinia has costal proliferatiors, costal fertile leaflets, a cystocarp without a beak, 

 and, above all, an apex built after the fashion of Hypoglossum Woodwardii. It is not 

 possible to refer D. camosa to this, nor to any other already described genus. 



Female plant and cystocarp. Fig. 10 a represents a piece of a female specimen. The 

 fertile leaflets are tufted, of variable size (2 — 10 mm), situated in the sinuses of the mar- 

 gin or just inside this, but stray groups occur in the vicinity of the costa. They are short 

 stipitate, ovate, obovate or lanceolate, blunt or emarginate. The stipe produces proli- 

 ferations, and thus causes the tufted habit. Each leaflet carries a single lateral cysto- 

 carp on the thick midrib. Fertile segments and larger proliferations, that do not de- 



cc 



st c. 



§ ^°&£<w5^ 



vcp 



C2 



wSoD 



mmmM 



co 



Fig. 1 1 . Microrhinus carnosus: å length section of female leaflet with young cystocarp, only three central cells drawn, 

 X 50; b details of cystocarp, X 180; C — d eross section of tetrasporophylls, X 180. — cc central cells, pc pericentral cells, 



ac auxiliary cell, stc sterile cells, gon gonimoblast. 



serve to be called »cystocarpophylls », also occur. The ripe cystocarp (fig. 10 c) is strongly 

 prominent and provided with a conspicuous beak directed toward the tip of the leaflet; 

 they resemble the cystocarp in Pantoneura, where, however, the beak is less developed. 



The earlier stages have not been found, but the låter ones agree very well with 

 Kyiin's description and figures of Pantoneura, making a repetition superfluous (see fig. 

 Ila, b, 10 d). I shall only add that the chamber of the cystocarp undergoes a secon- 

 dary enlargement by the loosening of the surrounding tissue. The large fusion cell and 

 the open connection between this and the central cell are in accordance with Panto- 

 neura (comp. fig. 10 d with Kylin fig. 24 d — e). The ripe carpospores are ovoid or 

 slightly obovoid. 



Tetrasporic plant. The tetrasporophylls occupy the same position as the female 

 leaflets (fig. 10 b). Generally they are broadly ovate and acute. From the stipes of 



