CHLOROPHYCE.E 



141 



It might, with almost equal fitness, be placed else- 

 where. Its remains are in the form of small egg- 

 shaped bodies with a hole at each end, and each of 

 these is taken by Munier Chalmas to represent the 

 beads in the filaments of a 

 Penicillus-like plant. 



In Rhipocepliahis there is an 

 erect incrusted stalk giving off 

 at intervals numerous small 

 fronds also incrusted, composed 

 of dichotomous filaments. It 

 forms a transition to the next 

 genus. 



Udotea has the same fan-like, 

 stalked fronds as Avrainvillea, 

 but in this case they are in- 

 crusted, in some species very 

 little, in others thickly. The 

 filaments are little interwoven, 

 but in addition to the incrusta- 

 tion they are bound together 

 by numerous short lateral 

 branches terminating in hap- 

 tera or sucker-like holdfasts. 

 The fronds in some species are 



_ . , f - . FIG. 39. Rkipocfpkalw 



beautifully Zoned, and there IS fhamix one-half the natural 



in nearly all a tendency, more 



or less marked, to proliferation at the margin. The 



round bodies, figured by Kiitzing, which have been 



taken to be zoosporangia, are probably of foreign 



origin. 



Halimeda is the most singular of the group in the 



