228 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



Fig. 215. Antithaninion 

 antillanuin nov. spec. 

 Branchlet with gland- 

 cells. (About 180 : 1). 



1) Grunow, a., Algæ in 

 tab. 6, flg. 3. 



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 n long, 

 and 40 fx 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 pinnæ in the corner -between this and 

 the rachis of the branch. 



As to the gland-cells the present Anti- 

 thamnion, as mentioned above, is closely related 

 to A. cruciatum, but on the other hand it 

 dillers essentially from this species. As to these 

 organs my plant seems to come near, also, to 



Grunow's Sporacan- 

 thiis compactus^), 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 

 branchlets provided 

 on its upper side with 

 the gland-cell, and 



'Raise der österr. Fregatte Novara", 1870, p. 60, 



Fig. 216. Antithamnium antillanum nov, spec. 

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

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

 cell. (About 300 : 1). 



