— 16 — 



Figures 9 C and D show two young procarps. I have only 

 succeeded in finding remains of the trichogyne, it seems to be very 

 perishable in accordance with what Schmitz (1. c. p. 280) also 

 mentions as being the case in Seirospora interrupta (Engl. Bot.) 

 Schmitz, which most probably was the reason why Buffham^) 

 has not detected the trichogynes in plants examined by him, 



I have also not been able to find out with certainty in the 

 rather scanty material, whether the carpogonic cell-thread consists 

 of 3 or 4 cells. Schmitz (1. c.) in his diagnosis of the genus 

 Seirospora describes the carpogonic cell-thread as most often 4-celled 

 but in Seirospora interrupta he has found (1. c. p. 280, note 3) that 

 the carpogonic branch consists of 3 cells only. 



After the fertilization both auxiliary cells begin to divide and 

 produce the ramified sporogenous cell-threads of which the cystocarps 

 consist. 



The antheridia are distributed in the same way as the tetra- 

 spores, placed on the uppermost and inward turned side of the 

 mother-cell (Fig. 8 D). They consist of quite short branches which 

 bear the spermatangia on their surface. Most often they grow 

 quite closely in dense tufts, sometimes as Fig. 8 E shows also more 

 scattered. 



Paraspores were not present in my plant. 



As already mentioned by Schmitz (I.e.) it is very probable 

 that several species which have been referred to the genus Calli- 

 thamnion belong to the genus Seirospora and De-Toni has also 

 in his "Sylloge" referred a number of species, earlier considered 

 as belonging to Callithamnion, to the genus in question. But several 

 of these species have hitherto been so incompletely described and 

 badly or not at all figured that we can scarcely have any fixed 

 opinion regarding them. It cannot be denied therefore that my 

 species may perhaps turn out to be identical with one of these 

 incompletely described forms, even if at present I have not succeeded 

 in referring my species to any of them. 



Compared with the two at present best known species of 

 Seirospora^ viz. S. Griffithsiana and S. interrupta, my species is 

 easily distinguished. 



^) 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). 



