128 CHORD ARIACE^.—LiEBMANNiA. iv. 



the same as his own. J. Agardh, taking up Areschoug's M. Zosterce, as identical 

 with his own Myriocladia Zosterce, states that the cells of the peripheric fila- 

 ments are subspherical ; and describes a new species, M. Lovenii, in which they are 

 twice as long as broad. In my specimens now described I find the peripheric cells 

 of the length attributed to those of M. Lovenii, and yet I hesitate whether to refer 

 them to that species. I have not seen any authentic specimen of either Agardh's 

 or Areschoug's plant, and must leave the final determination of the difficulty to 

 those who have such specimens to compare. 



Plate X. A. Fig. 1. Fronds of Mesogloia Zosterce, growing on Zostera marina, 

 the natural size ; fig. 2, small portion of a branch, magnified ; fig. 3, some of the 

 axial and peripheric filaments of the same ; fig. 4, portion of one of the peripheric 

 filaments ; the latter figures highly magnified. 



III. LIEBMANNIA. J. Ag. 



" Frond cylindrical, branched, filamentous, solid, clothed with radiating periphe- 

 ric filaments. Axis composed of oblong, approximated cells, cohering in longitudi- 

 nal filaments ; the filaments toward the centre narrower, and there collected into a 

 peculiar dense stratum. Peripheric filaments arising from the outermost axial 

 cells, mucous, moniliform, forked. Spores obovoid, seated in the axils of the 

 radiant filaments, girt with a hyaline perispore. Fropagula at the apex of the 

 radiating fibres lancioid, one, two or four, sessile within a hyaline, inflated, obpyri- 

 form perispore, sub-articulate-constricted, and longitudinally divided." — /. Ag. 



Liebmannia LeveUlei, J. Ag. Alg. Medit. p. 35. Sp. Alg. vol. \,p. 61. Mesogloia 

 LeveUlei, Menegh. Alg. Ital. p. 283, h. 5, t. 2. 



Hab. Parasitical on Zostera. At Vera Cruz., Mexico, Liebman. (v. s. in 

 Herb. T.C.D.) 



I give the characters of this genus as nearly as possible in Prof. J. Agardh's 

 words. I have not seen an American specimen, but possess an Adriatic one from 

 Prof Meneghini. This has the outward characters of Mesogloia vermicularis. 



