(76) 



filaments, densely packed, and interlacing and anastomosing, the articu- 

 lations long, swollen at the ends, and partially filled with a slender 

 thread of endochrome ; the outer part of the frond composed of cells, 

 those next the axis large, roundish oval, in'egular, those towards the 

 surface minute, arranged in vertical moniliform series. Substance 

 subcarnose, very soft when fresh, firm when dry, and the younger parts 

 only perfectly adhering to paper. Colour, a rather dull brownish red, 

 reddish pink in the Irish specimens. Favellidia, minute dots scattered 

 over the whole surface of the frond, attached to the inner surface of the 

 cellular periphery, and slightly prominent on the surface. Tetraspores 

 we have not seen. 



This fine species it has been thovight desirable to remove from Kally- 

 m.enia and. unite with Iridoea, with which it seems to have a closer aflinity 

 both in structm'e and fructification. The name is more applicable to 

 S. edulis than to the present species, which is thinner, more flexible, 

 and less brittle than in that species, and less liable to be torn or split by 

 the action of the waves. 



Miss Warren's specimens from Falmouth Harbour are of a rather 

 deep brownish red coloui', darker towards the base, and not iinlike in 

 tint some of the varieties of Rhodymenia imlmata, but the substance, 

 when fresh, is much more soft and flaccid. 



The Irish specimens, on the contrary, kindly sent us by Mr. D. Moore, 

 of Dublin, are of a rather bright brownish red, and somewhat glossy, 

 being much less deep than those of Miss Warren, and are without fruit. 



From S. edidis it may be readily known by its much thinner and 

 less rigid fronds, the smaller cells of the base of the vertical filaments, 

 and very slender filaments of the axis. 



It is still a desideratum in the Flora of Scotland, although two 

 stations are given in the Orkney Islands.. 



EXPLANATION OP PLATE XCV. 



Fig. 1. — Schizymenia Duhyi, natural size. 

 2. — Portion of frond witli favellidia. 

 3. — Section of same. 

 4. — A favellidium. 

 5. — SiDores from same. All magnified. 



