220 



RHODOPHYCEAE 



crisping over a fire, can be dropped into culinary dishes in order 

 to add a savour. 



Eu-florideae 



NEMALIONALES, GELIDIALES 



*Batrachospermaceae : Batrachospermum [batracho^ frog ; spermiim, 

 seed). Fig. 144. 



Two genera commonly found in fresh waters, Batrachospermum 

 and Lemanea, belong to the Nemalionales. Batrachospermum 

 moniliforme, which is a very variable species, is found attached to 





ilV 



% 



his 



Fig. 144. Batrachospermum moniliforme. A, plant. B, portion of plant. C, carpo- 

 gonial branch ( x 480), D, fertilized carpogonium ( x 360). E, mature cystocarp 

 ( X 240). F, antheridia ( x 640). (A, B, after Oltmanns; C-F, after Kylin.) 



stones in swift-flowing waters of the tropics and temperate regions. 

 The thallus is soft, thick and gelatinous, the primary axis, which 

 grows from an apical cell, being formed of a row of large cells. 

 Numerous branches arise in whorls from the nodes, the basal 

 regions of these branches producing corticating cells that grow 

 downward and invest the main axis. The cells of the thallus are 

 uninucleate and contain only one pyrenoid. Reproduction takes 

 place by means of monospores, carpogonia and antheridia, the 

 latter organs arising as small, round, colourless cells at the apices of 

 short, clustered, lateral branches. The carpogonia are also terminal 



