FRESII-WATEU ALG^ OF THE UNITED STATES. 107 



Sp. qiiinina, (Ag.) Kxjtz. 



Sp. saturate viridis, valde lubricata; articiilis stcrilibus diamctro 1-0 jilo longiinilius ; articuliri 



fertilibus vel baud tumidis vel nonnihil tumidis ; fascia uuica ; spine aufractibus modo dfii- 



' sioribus, modo laxioribus, nonnunquara laxissimis, pleruiuque 3, intcrdum l^-i ; cytiod(!riiial(; 



cellute utroque fine nee protenso ncc replicato ; zygosporis aut globosis aut ovalibus aut 



cylindricis. 



Dtam.— Artie, steril. 7J3j"_7l3/' = .0013"— .0017" ; sporis ^|^5" = .0014". 



Si/n. — Sp. quijiina, (Agardh)K1;tzing. Ivabenuorst, Flora Eump. Alg-ariim, Sect. III. p. 



240. 

 JTab. — la stagnis, prope Philadelphia. 



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

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

 times laxor, 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 tlie ditches aronnd Pluladclpliia, 

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

 mouth 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 

 »ther instances it is markedly swollen. 



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

 t a, 4 b, and 4 d, portions of fertile filaments. 



f f Fasciee spirala; diae i-rl pltn-es. 

 ff Chlorophyl filaments tivo or many. 



"^p. decimina, (Muller) Ktz. 



Sp. sordidu viridis, lubrica; articulis sterilibus diamctro (O.OOl.TJ" — 0.001.59") plerumque 

 duplo-, quadruplo fere longioribus, nonnunquam subieqiialibus, fertilibus aut non aut nioiliee 

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

 1-H; zygosporis aut ovalibus aut late ellipticis vel subglobosis. (R.) 



iiijn. — ,S'/). decimina, (Muller) Kuizino. Eabenuorst, Flora Europ. Algarum, Sect. III. p. 

 242. 



Hub. — Prope Philadelphia. 



Dirty green, slippery; sterile joints mostly from 2-4 times as long as broad (0.0013.5" 



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

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

 spores either oval, broadly elliptic, or subglobose. 



RemarJcs. — 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 llabenhorst. 



Sp. dubia, Ktz. 



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

 fasciis spiralibus 2-3, angustissiinis, nodosis, anfractibus laxis 1-2 (=3-0); cytioderniate 

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



