FKKS II -\v A T K K A I. <;.!: ()! T II K UNITED STATES. 169 



diameters. Fig. 5 c is an outline of a pair of fertile cells enlarged to the same 



nt. 



Sip. partispora, WOOD. 



Sp. articulis sterililms diainetro 2-4 plo longioribus ; fructifcris baud tumidis, diametro 1-2J plo 

 lougioribus; fu.-ciis spirulibus 4, angustis, nodosis, aufractibus pluribus ; zygosporis parvis- 

 simis, clliptit-iu, diuiuctro 1^-2 plo longioribus; cytiodenuate utroque fine nee protenso IK-C 

 rr|>licato. 



Diam.-A.ri. steri! T !3 B "-.003"j spor.diam. transv. T i8a" rifo"-- 003" .0023", long. T J1 " 



SO " 



- T00 



. S. parvisjwra, WOOD, Prodromus, Proc. Am. Philos. Soc. 1869, p. 139. 

 /fab. In stagnis, llibcrnia, Florida. (Wst CANBY ) 



Strrilr joints 2-4 times longer than broad; fertile not tumid, 1-2$ times longer than broad; 

 rlilnrip|iii\| liiimls 4, narrow, nodose; turns many; zygospores very small, elliptical, 1^-2 

 times IniiLri r than brood; cell wall not infolded at the end. 



l.-x. I am indebted to Mr. Wm. Canby for specimens of this species, 

 which lie collected in a pond in the Pine Barrens near Hibernia, St. John's River, 

 Florida. It is remarkable for the comparatively small size of the spores, which do 

 not nearly lill the perfectly cylindrical mother-cells ; indeed they are only about as 

 lonir as the latter are wide. This species closely resembles S. majuscula, but is 

 r, does not, that I have ever seen, vary like it in the number of spores, and is 

 especially separated from it by the very small size of the latter. 



Fijj. 7, pi. 15, represents a fertile pair of filaments of this species magnified 125 

 diameters. 



!>. in.i |>-< nl.i. KTZ. 



Sp. pallide et sordide viridis, frnctus tempore fusceseens ; articulis sterilibus diaraetro (0.002U" 

 0.0025") 2^-4-10 plo longioribns; cytiodermate tcnui homogenco ; fasciis 3-4 5 (rarius 

 7), modo subrectis longitudinalibus, modo laxissiuie spiralibus, nodosis; zygosporis globosis 

 TC! ovalibus. (R.) 



,s'i/n. S. majnacula, KUTZINO. RABENHORST, Flora Europ. Algarum, Sect. III. p. 244. 

 //,;/,. Projie Philadelphia. ? 



Pale and sordid preen, fuseescent at the time of fruiting; sterile joints 2^-4-10 times longer 

 than broad (.0022" 0025") ; cytioderm thin, homogeneous ; spiral filaments 3-4-5 (rarely 7) 

 partly straight ish and longitudinal, partly laxly spiral, nodose ; zygospores globose or oval. 



Ii'iit<i-k. Shortly after I commenced to study the fresh-water algse, I found 

 below the city a fruiting Spirogyra, of which I preserved only a drawing, which I 

 have since identified as apparently specifically one with the European S. majuscn?<i, 

 it differing only in not being quite so large; my measurement was T J T " = 0.002". 

 Not having any specimens at hand, I have copied the description from the work of 

 Prof. Rabenhorst. 



Fig. 1, pi. 15, was copied from the drawing alluded to. 



*! nitida, (DILLW.) LINK. 



Sp. ctespitibns, lubricis, saturate viridibus; articnlis sterilibns post dirisionem diametro sub- 

 cqualibus, ante divisionem 23 plo longioribus ; articnlis fertilis aliis simillibus, baud tumidis ; 

 fasoiig spiralibus 4(3-4 R.), niodice latis, anfractibus 1-2; zygosporis ellipticis. 



23 Augut. 1873. 



