FRESH-WATER ALQJE OF TEE UNITED STATES. 167 



Sp. quinina, (Ag.) Kutz. 



Sp. satiirate viridis, valde lubricata; articnlis sterilibus diametro 1-6 plo longioribus ; articulis 



fertilibus vel baud tumidis vel nonnihil tumidis ; fascia unica ; spirse anfractibus modo den- 



sioribus, modo laxioribus, nonnunquam laxissimis, plerumque 3, interdum 1^4 ; cytiodermate 



■ cellulsB utroque fine nee protenso nee replicato ; zygosporis aut globosis aut ovalibus aut 



cylindricis. 



Dmm.— Artie, steril. ^io^"_^|3^" = .0013''— .0017" ; sporis ^iy = .OOU". 



Syn. — Sp. quinina, (AGARDn)KuTZiNa. Rabenhorst, Flora Europ. Algarum, Sect. III. p. 

 240. 



Hab. — In stagnis, prope Philadelphia. 



Deep green, very slippery, sterile articles 1-6 times longer than broad ; fertile joints scarcely 

 or not at all tumid ; chlorophyl filament single ; turns of the spiral sometimes denser, some- 

 times laxer, sometimes very lax, mostly 3 in number, sometimes 1^4 ; cytioderm neither 

 infolded nor protruded at the end ; zygospores polymorphous, globose, elliptical or cylindrical. 



Remarks. — This species is very abundant in the ditches around Philadelphia, 

 especially in the " neck" below the city. I have found it fruiting profusely in the 

 month of April. The spores vary very much in form, some of them being globose, 

 others elliptic, and still others cylindrical, with obtusely rounded ends. All these 

 forms may occur in a single filament. The spore cell also varies in the amount of 

 its enlargement. In many cases it preserves its cylindrical shape completely ; in 

 rther instances it is markedly swollen. 



Figs. 4e, 4 c, pi. 19, represent portions of sterile filaments of this species; figs. 

 fa, 4 6, and 4 d, portions of fertile filaments. 



.■\'\ Fasciae spiralas duse vel plures. 

 ■(•■f- Chlorophyl filaments two or many. 



f p. decimina, (Muller) Kf z. 



Sp. sordide viridis, lubrica; articulis sterilibus diametro (0.00135" — 0.00159") plerumque 

 duplo-, quadruplo fere longioribus, nonnunquam subsequalibus, fertilibus aut non aut modice 

 tumidis; fasciis spiralibus plerumque 2, latis, decussatis, rarius 1 vel 3, anfractibus laxis 

 I-I5; zygosporis aut ovalibus aut late ellipticis vel subglobosis. (R.) 



Syn. Sp. decimina, (MiJLLER) Kutzing. Rabenhorst, Flora Europ. Algarum, Sect. III. p. 



242. 



Hah. — Prope Philadelphia. 



Dirty green, slippery; sterile joints mostly from 2-4 times as long as broad (0.00135" — 

 0.00159"), sometimes about as long as broad; fertile joints either moderately or not at all 

 swollen; spiral filaments mostly 2, broad, decussating, rarely 1-3, turns loose 1-1^; zygo- 

 spores either oval, broadly elliptic, or snbglobose. 



Remarhs. I find this species marked in one of my note-books as having been 



found by myself near this city. I have no distinct recollection of seeing it, and, 

 having preserved neither figure, specimen, nor description, am forced to content 

 myself with copying the description of Prof. Eabenhorst. 



Sp. dnbia, Ktz. 



Sp. viridis in fructe dilute viridis; articulis sterilibus cylindricis diametro 1^-2J plo longioribus ; 

 fasciis spiralibus 2-3, angustissimis, nodosis, anfractibus laxis 1-2 (=3-6); cytiodermate 

 utroque fine nee protenso nee replicato, nonnihil crasso ; zygosporis polymorphis, aut sub- 



