224 



phores are thread-like, shorter or longer, and irregularly sinuated 

 (Fig. 210 , E, F). 



I have found plants with tetraspores, antheridia and cysto- 

 carps, w r hich all occur on separate individuals. 



The tetraspores are sessile on the uppermost and inner 

 side of the mother-cells (Fig. 210 B, C), when young they 



are oval or obovate, when 

 quite developed nearly spheric- 

 al; they are commonly tetra- 

 hedrally divided more seldom 

 cruciately (Fig. 210 C). 



The cystocarps are com- 

 posed of two oppositely-placed 

 gonimoblasts, which, when ripe, 

 consist of the ramified monili- 

 form threads of the uniseriated, 

 nearly spherical carpospores 

 (Figs. 209, 211 A) ; the latter 

 are about 40 42 ^ broad. 

 These peculiar seirosporic cysto- 

 carps agree very well, apart 

 from the form and size, with 

 those found in Seirospora 

 Griffithsiana Harv. and which 

 BORNET was the -first (Notes 

 algologiques, I (1876) p. XIV) 

 to explain as cystocarps in 

 contradistinction to the para- 

 spores (seirospores) also occur- 

 ring in this plant. 



Fig. 211 C shows a procarp. 

 I have only succeeded in find- 



Fig. 212. Seirospora occidentalis Borgs. 



Part of a plant with paraspores. 



(About 125:1). 



ing remains of the trichogyne, it 

 seems to be very short-lived as 

 SCHMITZ (1. c., p. 280) also men- 

 tions being the case in Seiro- 

 spora interrupta (Engl. Bot.). Most probably this is the reason 

 why BUFFHAM ! ) has not detected the trichogynes in plants examined 

 by him. 



! ) BUFFHAM, T. H., On the reproductive organs, especially the Antheridia, 

 of some of the Florideae. (Journal of the Queckett Microscopical Club, 

 Vol. IV, Ser. II (1891) p. 252). 



