F. Borgesen: List of species. 



483 



seen sufficient to be able to refer the plant to its systematic place, 

 this without doubt being among the Gigartinaceæ, as the develop- 

 ment of i:he cystocarp seems to proceed along similar Hues as in the 

 case of Harveyella and Choreocolax, though with some differences. 



To judge from the youngest stages found the sporogenous 

 filaments grow out, after fertilization, from the central cell in all di- 

 rections between the rather 

 loose parenchymatic tissue 

 and send off here and there 

 short ramified filaments 

 from which the carpospores 

 are formed. Gradually, as 

 the carpospores increase in 

 size and number, the cells 

 of the parenchymatic tissue 

 are squeezed together in 

 such a way that a small 

 globular space is formed 

 which is filled with the 

 carpospores (Fig. 435 c). 

 These are roundish-triangu- 

 lar in shape. Their diameter 

 reaches a length of about 

 20—22 fjt. Near the base of 

 the . cavity I have seen a 

 large multilobed cell most 

 probably being the auxihary 

 cell after the fusing with the 

 sterile cells. I have not found 

 any carpostome, the spores 

 most probably becoming 

 free by dissolving or bursting of the wall. Several cystocarps are 

 present in each plant; they are formed in the processes, these 

 getting a hemispherical shape. 



Compared with Choreocolax and Harveyella, as these are known 

 from the descriptions by Sturch^) and by Richards^), my plant 



J) In Annals of Botany, vol. 13, 1899, p. 83. 



2) Richards, H. M., On the structure and development of Choreocolax 

 Polysiphoniæ (Proceed. Amer. Arts and Sciences, vol. 26, 1891, p. 46). 



31* 



Fig. 435. Hypneocolax stellaris nov. spec. 

 a, part of transverse section with spor- 

 angia, b, transverse section of male plant, 

 c, transverse section of a cystocarp. (a, about 

 175:1; b, about 200:1; c, about 150:1.) 



