228 



a young state (Fig. 216 e) ; this seems exactly 

 to correspond to the description and figures 

 of NESTLER. A young cell, the first beginning 

 to the pinnule carrying the gland-cell, we 

 find divided, by a longitudinal, somewhat 

 curved wall, into two cells; of these the 

 smaller one is the young gland-cell, while 

 the larger cell afterwards by transverse 

 walls is divided in two to four, seldom 

 more cells. 



In the dried material a few tetrasporangia 

 occurred (Fig. 216 a). These were of an 

 oblong-cylindrical shape, about 90 p long, 

 and 40 p. broad, with broadly rounded apex 

 and base ; they were cruciately divided. The 

 few tetrasporangia "in situ" I have come 

 across were placed upon the basal cells of 

 the pinnse in the corner between this and 

 the rachis of the branch. 



As to the gland-cells the present Anti- 

 Fig.215.Antithamnion thamnion, as mentioned above, is closely related 



antillanum nov. spec. 

 Branchlet with gland- 

 cells. (About 180 : 1). 



to A. cruciatum, but on the other hand it 

 differs essentially from this species. As to these 

 organs my plant seems to come near, also, to 



GRUNOW'S Sporacan- 

 thus compactus 1 ), but 

 otherwise it has no 

 likeness to this plant. 

 We may point out 

 as the most charac- 

 teristic features of our 

 plant : the alternate 

 branching of the 

 branchlets through- 

 out, the mostly single 

 pinnule on the under 

 (outer) side of the 



Fig. 216. Antithamnium antillanum nov. spec. 

 a, part of filament with tetrasporangia. b, c, d, 

 pinnae with gland-cells, e, development of gland- 

 cell. (About 300 : 1). 



branchlets provided 

 on its upper side with 

 the gland-cell, and 



GRUNOW, A., Algse in "Reise der osterr. Fregatte Novara", 1870, p. 60, 

 tab. 6, fig. 3. 



