THE ANTHERIDIA OF CHAMPIA PARVULA. 163 



those writers who have made detailed studies of the morphology 

 of the genus do not mention it in any way whatsoever. Debray 

 (4) in his papers upon the structure and development of Chylo- 

 cladia, Champia and ivomeri/arm, considers only the vegetative 

 structure, the cystocarps, and the tetraspores. Hauptfleisch 

 (6) in an exhaustive paper upon the fruiting organs of Chylo- 

 cladia, Champia, and Lomentaria, likewise does not include 

 the antheridia. Buffham (7) in a paper devoted mainly to the 

 antheridia of certain Florideae, has described and figured the 

 antheridial forms of about twenty genera and species, but he 

 does not refer to Champia in his discussion. "Webber (5) in 

 a note upon the antheridia of Lomeiitaria vncinaia, says that 

 they form little spherical heads upon the tips of the branches 

 of the frond. A section through a head shows it to be a tuft 

 of radiating filaments, of two to four cells each, originating 

 from the terminal cells of the branch, and bearing at their 

 extremities the antheridial mother-cells. He also states 

 that one of these antheridial plants likewise bore numerous 

 tetraspores. 



Observations made in 1895 by the writer upon plants of 

 Lomentaria unciiiata gave the following results. A number 

 of detached plants were first examined thoroughly in order to 

 make sure that no organs resembling those described by Web- 

 ber were present. These were placed for a time in a dish of 

 quiet water, when it was found that they attached themselves to 

 the sides of the dish by the tips of the branches of the frond. 

 These plants, upon being carefully removed and sectioned, 

 showed that there had been developed upon the tips small 

 disks composed of several layers of radiating cells, the outer- 

 most of which were colorless and densely filled with highly 

 refractive granules of protoplasm, so that they might readily 

 have been mistaken for antheridia. The writer is therefore of 

 the opinion that although the structures described by Webber 

 bear a strong resemblance to antheridia, they are in reality 

 secondary holdfasts developed upon the" tips of the branches 

 of the frond. 



Webber also reports that structures similar in position and 



