younnf parts and pinnate or subbipinnate in the older. The whole frond 

 has a feathery appearance. The surface of the disc, in well-ii;rown plants, 

 is sprinkled with ciliary processes, more or less developed. Hooked tendril- 

 like rainuli, like those so common in Jlypnm., are frequently found in the 

 lower part of the frond or of its se<2;nients. Oi/stocarps nearly spherical, on 

 the marginal cilia ; pericarps composed of dichotomous, moniliform, radiating 

 filaments, rather widely separated by transparent gelatine, and with a wide 

 p«llucid coating of the same ; spore-threads issuing in separate bundles from 

 a central placenta. Tetraspores dispersed. Colour a full and rather deep 

 red, preserved in drying. Substance soft and membranous. In drying the 

 frond closely adheres to paper. 



This handsome plant has so much more the aspect of a Hypnea 

 than of a Rhodojphyllis that I formerly unhesitatingly referred it 

 to that genus, notwithstanding its flat frond. But a closer in- 

 spection and analysis of frond and fruit compel me to remove 

 it from Hypnea ; nor can I find any better place to put it than 

 in BhodopJiyUis, where it may stand next to the narrower varieties 

 of B. membranacea. A clean cross-cutting of the cystocarp is a 

 beautiful object under the microscope, owing to the size and 

 brilliancy of the peripheric cells, and the clearness and abundance 

 of the gelatinous matrix in which they are set. 



rig. 1. RnoDOPHYLLis HYPNEOiDES, — the natural Size. 2. Transverse section 

 of the frond. 3. Fertile ramulus, bearing conceptacles. 4. Transverse sec- 

 tion through a conceptaele. 5. Tetraspores : — variously magnified. 



