— 3 



quaternas diametros longse, chromatophorum parietalem, pyrenoide 

 laterali instructum, continentes. Monosporangia sessilia, rarius pedi- 

 cellata, lateralia, seriatim posita, ovata, 7 — 9/^ lata, 10 — 12^ longa. 



This species was once found growing on Hypnea spec. The 

 endophytic branches (Fig. 2 (7, Z>, E) consist of irregularly shaped, 

 short cells; they creep among the surface cells of the host plant 

 and from there short branchlets penetrate downward in a more 

 vertical direction. The erect 

 filaments (Fig. 2-4) arise in small 

 numbers from the middle of 

 the basal endophytic branches. 

 They are not very richly rami- 

 fied; the side-branches grow at 

 an acute angle from the mother 

 branch; these are more often 

 alternate but have some ten- 

 dency to be secund. 



The cells are cylindrical, 

 not constricted, usually 2—4 

 times as long as broad. They 

 contain a well developed parietal 

 chromatophore (Fig. 'HB) with a 

 large pyrenoid lying to the one 

 side of the cell. 



The sporangia are seriate 

 on the upper side of the branch, 

 sessile or very seldom stalked, 

 i. e. situated terminally on one- 

 celled branchlets; I have always 

 found them solitary. 



Hairs do not occur. Sexual 

 organs were not observed. 



My plants seems to be rather like Chantrcmsia Chiloensis Reinsch 

 (Gontrib. ad Algolog. et Fungolog., Vol. 1, 1875, p. 39, pi. XI, fig. 1) 

 which was found at St. Thomas; but my plant differs among other 

 characters by having endophytic branches which are wanting in 

 Reinsch's plant, by the greater thickness of the erect filaments 

 and by not having two monosporangia together, as figured by 

 Reinsch, whose description for the rest is rather poor. Our plant 

 comes perhaps also near to Chantransia barhadensis Vickers judging 



1* 



Fig. 2. Chantransia Hypnece nov. spec. 



A, plant with monosporangia (100: 1). B, cells with ] 



chromatophore and pyrenoid (250:1). C, D, E, hasal 



part (C, 250 : 1, D and E, 200 : 1). 



