ChorclariecE.'] mesogloia. 169 



to the colourless tips of the filaments. — iSTamed Leathesia, in 

 honour of the Rev. Mr, Leathes, a British naturalist. — Harvey. 



1. Leathesia Beukeleyi, Harvey. 



We shall briefly say of this, in the words of Professor 

 Harvey — " a small plant_, more curious than beautiful, first 

 noticed by the Eev. M. J. Berkeley, on rocks at Torquay/'' 



2. Leathesia TUBERiroRMis, Gray. 



This differs from the former, which is a dense and solid 

 substance, by being at first flocculent within, and then 

 hollow. With this species I had long been familiar, without 

 knowing its name, till it was pointed out to me in the 

 island of Arran, by Dr. Greville, as the Corynephora marina 

 of Agardh. It is of a light yellow colour, and after a breeze 

 in summer it may be seen in heaps in the little bays, not 

 unlike bunches of hops, were it not for irregularity in size. 



Genus XXXIV. MESOGLOIA, Agardli. 



Gen. Char. Prond filiform, much branched, gelatinous. Axis 

 composed of loosely packed, longitudinal, interlaced filaments, 

 invested with gelatine ; the periphery of radiating filaments, 

 whose apices produce clusters of club-shaped, moniliform fibres. 

 FiTictification, obovate spores, seated among the apical fibres. — 



