RJiodomele^E.'] polystphonia. 291 



D. Moore ; in Scotland, by Capt. Carmichael, at Appin ; by 

 Miss Eamsay, Spring Bank, Arran ; by D. L., Corrie, Arran ; 

 by D. L._, jun., Corriegils, Arran. I know only of one place 

 where it is got on the coast of Ayrshire, — in the little 

 , harbour at Portincross, where it was first found by Mrs. 

 Ovens and Major Martin. 



Though cartilaginous, it adheres to paper, and forms a 

 beautiful specimen. Colour, brownish, becoming black in 

 drying. 



Genus LXXXY. POLYSIPHONIA, Greville, 



Gen. Char. Prond filamentous, partially or generally articu- 

 late ; joints longitudinally striate, composed internally of parallel 

 tubes, or elongated cellules. Fructification twofold, on distinct 

 plants : 1, ovate capsules (ceramidia) fm-nished with a terminal 

 pore, and containing a mass of pear-shaped seeds ; 2, tetraspores 

 imbedded in swollen branchlets. — The name is from two Greek 

 words signifying many tubes. — Harvey. 



1. PoLYSiPHONiA PARASITICA, GrevUle. (Plate XII. 

 fig. 47, plant of the natural size ; to the right, a portion of 

 a pinnule, and to the left, a portion of a pinnule with a cap- 

 sule, both magnified.) 



Hab. Parasitical on the larger Algae, and more frequently 



