548 University of California Publications in Botany [Vol. 8 



the vegetative structure of Eudesme J. Ag. A careful comparison of 

 Wyatt's Mesogloia virescens, no. 49 (Alg. Danm.) with our various 

 specimens shows so much variation in dimension of zoosporangia and 

 peripheral filaments that we feel nearly safe in referring all to the 

 European species which we refer, for reasons given above, to JEgira. 



29. Meneghiniella S. and G. 



Fronds cylindrical, more or less profusely branched, flaccid and 

 lubricous, with growth trichothallic ; medulla composed of numerous 

 colorless filaments compactly coalescing, giving rise to an abundance 

 of short, usually arcuate, color bearing, cortical filaments, whose lower 

 branches are transformed into linear, plurilocular gametangia, with 

 nearly uniseriate loculi, and usually more or less fasciculate ; zoo- 

 sporangia uncertain. 



Setchell and Gardner, Phyc. Cont., VII, 1924, p. 5. Cladosiphon 

 J. Agardh, Till Alg. Syst., II, 1882, p. 40 (not of Kuetzing). 



The genus described above is founded on a plant growing in 

 the Gulf of California. It seems, however, that our type must be 

 cogeneric with the Liehmanma Posidoniae Meneghini, whose type 

 locality is Naples and which was selected by J. G. Agardh as typical of 

 Kuetzing 's genus CladosipJion. We have shown above the results of 

 our attempt to determine the type of JEgira, which have led us to the 

 conclusion that the genus, as founded by Fries, includes the later 

 genera published under the names of Cladosiphon, Castagnea, and 

 Eudesme. Our plants seem to be typically trichothallic and have 

 longer or shorter, slender, linear gametangia, which are, at times, very 

 slightly swollen at, or about, the middle. The gametangia arise near 

 the base of the cortical filaments and are more or less fasciculate. As 

 we interpret Meneghini 's figures of Liehmannia, Posidoniae (1843, 

 pi. 5, fig. 1), he has represented the gametangia on the upper side of 

 figure 6 and also in figure c. A confusion is introduced, however, in 

 his representation of the contracted contents of the swollen terminal 

 cells of the cortical filaments (figs. 6, d, e, and /) by which they are 

 made to seem to agree with the gametangia of Liebmannia' Levillei 

 J. Ag. The figures of J. G. Agardh (1882, pi. 2, figs. Sa, 3&) represent 

 the cortical filaments with their swollen terminal cells and their game- 

 tangia of his Cladosiphon zostericola of Australia which seems clearly 

 to be referred to Meneghiniella. The genus Meneghiniella, in our esti- 

 mation, included M. Brandegeei S. and G. (type), M. Posidoniae 



