THE PLOB \ OF NEBH USE \. 61 



1-'.v.m. Cladophoraceae.— Thallus aliform, branched or simple, do hyaline 



root-like branches at base; chloropla its mostly disciform, parietal, single 

 or numerous by the division of the primary chloroplast; pro] 

 zoogonidia. 



Pam.— Pithophoraceae. Thallus of two distincl parts; l. the cauloid pari de 

 veloping from the germinating spore upward, branched and | 

 2, the rhizoid part developed from the spore downward, as a rule 

 and branchless; chlorophyll reticulately disposed; propagation by the 

 rounding up and thickening of certain vegetative cells either before or 

 without division. 



Fam.— Oedogoniaceae. -Thallus filiform, simple or branched, often attached by a 



basal lobed cell; terminal cell or branch often ending in a long, hyaline, 

 bulbously inflated awn; chloroplasts laciniate, often in longitudinal 



layers; propagation by zoogonidia: reproduction by antherids and 



Family. ULVACEAE. 



Thallus membranaceous or foliaceous, rarely tubular, of one or two layers of cells; 

 cells uninucleate, broad, often stratose; chloroplasts in parietal laminae; propagation by 

 zoogonidia; reproduction by the copulation of biciliate zoospores which form a four- 



ciliate zygote. The zygote remains motile for a short time and then coin'- to rest 



1. ENTfiROJIORFHA Link, Nees Hor. Phys. BeroL 5. 1820. 



Thallus greeu, filiform, tubular, either saccate-inflated, collapsed, or mem 

 branaceous, branched, fixed at base when young; endochrome usually 

 single, finally breaking up into numerous zoogonidia. 



Etymology: Greek evrepa, intestines, and < . form, 



JK ii to ro in orp ha intestinal is (L.) Link 1. c 

 Ulva intestinalis L. Sp. PL 1103. 1753. 



Thallus membranaceous or sub-intestiniform, 1 20 decimeters or more long, 



1-10 mm. or more wide, yellowish green, attenuate at ki-. tubular, 

 cate, often inflated above, simple or branched; cells polyhedral, 12 

 in diam. 

 Common in salt marshes throughout the state. PI. XIII . Fig. I. a. 



Eiiteroiiiorpha compressa (L.i Gbev. Alg. Brit. 180 

 Ulva compressa L 1. c. 



Thallus 3 decimeters long. 2-20 mm. wide, membranaceous, tubular-corn 

 pressed, simple or occasionally branched below; end obtusely rounded 

 and often inflated; cells minute, subquadrate and rotund. 

 In salt water with the last, but much less common. 



Family.-ULOTRICHIACEAE. 



Thallus filamentous, simple or branched, consisting of one row ol oells rarely ;i 

 double or multiple row);terminal cell in many oases ending in a soft, hyaline awn; ohlor- 



oplasts single in bands or rings, margins often laciniate; propagation by maci 

 microgonidia; reproduction by copula! ion of microgonidia 



