the name here quoted. I am not aware whether it has been 

 published by Chauvin. It is nearly related in structure to M. 

 strangulans but differs something in habit, forming a much larger 

 and thinner spot on the fucus. 



Fig. 1. Portion of the frond of Rhodymenia palmata with Myrionema Leclan- 

 cherii growing upon it: — natural size. 2. Myrionema Leclancherii. 3. Por- 

 tion of the same. 4. Filaments from the same. 5. Filaments and spores 

 in situ ■. — all more or less magnified. 



Plate XLI. (B). 



MYRIONEMA PUNCTIFORME, Han. 



Myrionema punctiforme ; patches globose; filaments tapering to the base; 

 spores linear-obovate, affixed to the vertical filaments near their base. 

 Myrionema punctiforme, Harv. in Hook. Br. Fl. vol. ii. p. 391. Man. p. 124. 



Linkia punctiformis, Lyngb. Hyd. Ban. t. 66. Carm. Alg. App. ined. cum 

 icone. 



Hab. Parasitical on the Floridese. Annual. Summer and Autumn On 

 Chrysimenia clavellosa, at Appin, Capt. Carmichael. On Ceramium 

 rubrum, at Torquay, Mrs. Griffiths. 



Geogr. Distr. Shores of Europe. 



Descr. Fronds or patches very minute, half a line or less in diameter, flattish 

 or globose, composed of vertical threads radiating from a small base. Fila- 

 ments slightly tapering to the base, with joints twice or thrice as long as 

 broad. Spores sessile near the bases of the erect filaments, very narrow in 

 proportion to their length, and much attenuated at the base. 



This little parasite is obviously nearly akin to M. Leclancherii, 

 from which its globose fronds or patches, and more narrow spores 

 distinguish it. It comes nearer to M. strangulans, but differs 

 in the position of the spores. The only specimens which I 

 have seen were collected by Mrs. Griffiths several years ago. 

 They were found on Ceramium rubrum, which they covered nearly 

 as closely as the warts of fructification cover Stilophora rhizodes. 

 Probably, if looked after, it may be found on many of our coasts. 

 It was added to the British Mora by the late Capt. Carmichael, 

 of Appin, whose many discoveries in minute botany have ren- 

 dered his name familiar to most algologists. 



B. Fig. 1. Ceramium rubrum with Myrionema punctiforme parasitical upon it : — 

 natural size. 2. Branch of the same. 3. Vertical section of part of the 

 Myrionema. 4. Filaments with spores. 5. A Spore: — all more or less 

 highly magnified. 



