396 



Halymenia pinnulata Ag., Aufzahlung etc. (Flora X, 1827, p. 645). 

 Chrysymenia pinnulata J. Ag., Alg. Mediter., p. 106; Spec. Alg., II, 

 p. 212; Epicr., p. 323. ZANARDINI, Iconogr. Adriat., I, p. 151, pi. 36 A. 



The wall of this rather large plant consists of several cell- 

 layers; innermost, towards the cavity in the interior of the frond, 

 the cells are large, becoming smaller outwards (Fig. 378 B). The 

 cortical layer consists of larger cells innermost, smaller at the 

 periphery; it is beautifully figured by KUCKUCK (1. c., 

 p. 219, pi. XIII, fig. 17) who, on the other hand, found the 

 cortical layer composed of short moniliform filaments consisting 

 of small roundish cells. This was not so marked in the West Indian 

 specimens except in the tetrasporic plant. 



Here and there, on the innerside of the large cells facing the 

 cavity in the interior of the thallus, a single one of these cells or 

 a few consecutive ones bear glands (Fig. 378 A). These glands 

 are as a rule placed immediately upon the membrane of the large 

 cells, more rarely I have found a few of the glands placed upon 

 a small roundish cell while the remaining glands were placed 

 immediately upon the wall of the large cell. In specimens from 

 the Mediterranean Sea KUCKUCK mentions that he also now 



and then has found such a small cell 

 between the gland cell and the large 

 cell (compare his fig. 19, pi. XIII). 

 The glands seem always to be soli- 

 tary, but several occur on each cell. 

 The glands are oblong-roundish when 

 seen from the side (Fig. 378 B}. 



Further, in the older part of the 

 thallus (comp. my remarks 1. c., 

 p. 181) we find hyphse-like filaments 

 growing out from the innerside of 

 the large wall cells (Fig. 378 C). 

 These filaments are irregularly bent, 

 often swollen in their lowermost 

 part, nearly cylindrical in their up- 

 per part consisting of cells about 16 // thick and 6 12 times as 

 long. The filaments are now and then ramified, KUCKUCK has 

 found similar hyphse in the Mediterranean plant. A few times 

 small nearly globular glands occurred upon the filamemts. 



n a 



noOo^0ooRo^o 



Fig. 379. Chrysymenia ventricosa 



(Lamour.) J. Ag. 

 Tetrasporangia in the cortical 

 layer (250:1). 



