MBELANOSPERME®. 63 
of P. latifolia and P. plantaginea I have never detected a single specimen at 
all resembling the plant known as P. tenwissima. 
Another parasite, very commonly found on Chorda filum, is the string- 
Fic. 65. Punctarva latifolia. Fic. 66. Punctaria plantaginea. 
like plant known as Litosiphon pusillus (Fig. 67, b), the generic name 
signifying siender tube. Multitudes of these tiny tubular fronds clothe-the 
long floating alga, sometimes for several feet together, spreading out like 
Fig. 67. (a) Punctaria tenvissima on perks jilum, (b) Litosiphon pusillus on Chorda 
une 
the hair of a bottle-brush; in early growth perfectly straight, but as 
the season advances, they become lax, and are twisted or curled and 
everywhere entangled, as represented in the illustration... Oval spores are 
