194 THE MARINE BOTANIST 



very dense in structure. Fructification : 1. Masses 

 of spores (favellidid) immersed beneath the outer 

 stratum. 2. Tetraspores in sub-defined sori. 



GRATELOUPIA FILICINA.— SLENDER 

 GRATELOUPIA. 



Root a minute disk ; fronds tufted^ linear ; stem 

 tapering to the base, and tip more or less set with 

 once or twice pinnated branches, drawn out at the 

 tips and contracted at the base, as are likewise the 

 ramuli. British specimens of this plant rarely ex- 

 ceed two inches in height ; foreign ones are stated 

 to be frequently eight to ten inches high. The 

 substance is membranaceous, scarcely adhering to 

 paper, but softer than in Gelideum corneum, some 

 varieties of which it is not always easy to distin- 

 guish it from. " Colour a dull dark purple, some 

 times greenish, very like that of Dumontia 

 filiformis. Favellidia minute, immersed in the 

 branches, with a pore ; cruciate tetraspores in the 

 smaller pinnules." — Harv, Grows attached to 



