— 19 — 



and the ramuli, which are few and scattered, taper very much to 

 the base and are attenuated to an acute point". From this thin 

 base the branches grow quickly thicker, cyhndrical, keeping about 

 the same thickness upwards and end in a broadly rounded apex. 

 The diameter of the branches is about 4 mm. 



The plant has a nice, clear-rose 

 colour; it is diaphanous, of a some- 

 what fleshy, succulent consistency. 

 On a transverse section (Fig. 1 1 A) 

 we find that most part of the tissue 

 consists of large , clear and thin- 

 walled cells; outside the latter follow 

 some few smaller cells and outer- 

 most towards the surface a bark-like 

 tissue consisting of 1—2 layers of 

 very small, more thick-walled cells; 

 seen from the surface the latter are 

 irregularly polygonal (fig. 11 B). 



The tetrasporic plants are quite 

 like the sterile. The tetrasporangia 

 occur scattered or in small irregular 

 groups in the bark-like layer. They are cells here transformed to 

 tetrasporangia and which by their growth gradually squeeze the 

 nearest bark-cells together. The tetrasporangia are cruciately 

 divided (Fig. 11 B, C). They are about 40^ long and 40^ broad. 

 The female plants bear the warty, dark-red cystocarps scat- 

 tered over the surface. The cystocarp itself is built quite in 

 accordance with the figure of Gracilaria confervoides given by 

 T buret in "Etudes phycologiques", PI. XL, fig. 4. 



This species was found commonly in the sea round St. Jan 

 in deeper water, about 15 fathoms. It was found with tetraspores 

 and cystocarps in the month of March. 



Fig. II. Gracilaria Blodgefti Harv. 



A, transverse section of the thallus (8:1). 



B, surface of the thalUis with tetraspores 

 (80:1). C, transverse section of the thallus 



with tetraspores (80 : 1). 



23.-10.— 1909. 



