408 



Dansk Botanisk Arkiv, Bd, 3. Nr. 1. 



the plant, a description of the development of the cystocarp. 

 And finally, in 1896, Davis ^) pubHshed a paper in which he 

 gives a very detailed description of the development of the 



cystocarp in Champia par- 

 vula. 



Referring to these exa- 

 minations with regard to 

 the structure and develop- 

 ment of the plant, I shall 

 only mention here that I 

 have often found the plant 

 creeping on the leaves of 

 Thalassia as well as on 

 larger algæ, for instance, 

 Udotea Flahelliim or Hali- 

 meda. The filaments are 

 more or less decumbent and, 

 from the nodes on that side 

 of the filaments facing the 

 hostplants, groups of sur- 

 face cells grow out forming 

 short hapters by means 

 of which the plant attaches 

 itself to the substratum 

 (Fig. 392). 



The tetraspores are 

 formed in the peripheral 

 layer in broad belts com- 

 prising several joints, gene- 

 rally rather close to the apex of branches (Fig. 392). 



The antheridial stands ( Fig. 393) form small roundish patches 

 which often cover several coherent joints rather densely; some- 

 times the whole upper part of a branch is covered. Davis has 

 1. c, 1896, pi. VII, fig. 1 figured a part of a male plant in which 

 these often large zones of antheridial stands are seen. 



A few young female plant have also been found; the cysto- 



cz?' 



Fig. 392. Champia parvula (Ag.) Harv. 



a, part of a creeping filament with rhiz- 

 oids and tetrasporangia (about 22:1); 



b, one of the bundle of rhizoids more 



magnified (about 60 : 1 ) 



^) Davis, B. M., Development of the cystocarp of Champia parvula (Bot. 

 Gazette, vol. 21, 1896, p. 109). 



