44 



Microcoleus, Desmaz.—M. gracilis, Hass. Dakota, per Dr. Hobby 



of Iowa City, 

 Sphaerozyga, Ag.— S. Ralfsii, Thw. Ponds. 



5. saccata, n. spec.—S. trichomatibus in thallis tubulosis, cylindrico- 

 elongatis, simplicibus, decern plus minus aggregatis, unciam usque ad 

 palmam longis, 2-3 lineas crassis, varie constrictis vel undulato-sinu- 

 osis, gelatinosis vel submembranaceis, mollibus, initio affixis, mox li- 

 bera natantibus et multum contractis ; trichomatibus subrectis, par- 

 alleliter aggregatis vel leniter curvato-implicatis ; articulis oblongis, 

 saepe subcylindraceis, aerugineis, arete conexis ; sporis numerosissi- 

 mis, cylindricis, sordide aerugineis, diametro 2-3-plo longioribus ; 

 cellulis perdurantibus globosis vel ovalibus, articulorum diametro 

 paulo vel duplo majoribus. Diam. art. 00016' -0002". Spor. diam. 

 0003" ; long. ooo6"-ooo9". Hab. in stagnis, New Jersey. 



This plant was found freely distributed along the shores, and in 

 the shallow waters of Cranberry Pond, N. J. It is peculiarly dis- 

 tinct in the cylindrical, vertical, sack-like growth of the thallus, one 



to three inches high. 



Tolypothrix, Ktz.— T. Aegagropila, Ktz. Coll. J. S. Adam, Lime 



Rock, Conn. 



T. bombycina, n, sp, T. castaneo-brunnea, trichomatibus pseudo- 

 ramubsque leniter curvatis, laxe intricatis, elongatis, basi breviter 

 concretis, internis brunneis ; modo distincte modo indistincte artic- 

 ulatis ; articulis subtilissime granulosis, diametro (.ooo48"-ooo55'') 

 equalibus, vel duplo brevioribus ; vaginis arctis, luteolis, Isevissimis ; 

 cellulis perdurantibus, semper basilaribus, subglobosis, singulis, vel 

 2-3-seriatis. 



Forms a dark brown silky stratum on wave-washed stones, along 

 the shores of Hopatcong Lake, New Jersey. According to earlier 

 authors this plant Avould be a Calothrix. 



Gloiotrichia, Ag. — I have found a very singular form of propaga- 

 tion in a plant of this genus. The spore contents break through 

 the base, enter into the heterocysts ; these enlarge, change color 

 from yellowish to bright green, and thus become sporangia, 

 which reproduce the gelatinous cysts in which the original form 



is developed. 



CHLOROPHYLLOPHYCEAE. 



Gloeococcus, A. Br. — G. mucosus, A. Br. 



Dictyosphaerium, Naeg.— D. reniforme, Bulnh. Pond, N. J.— D. 



Ehrenbergianum, Naeg. Coll. R. Hitchcock, N. Y. 

 Caelastrum, Naeg. — N. sphaericum, Naeg. Ponds, N. J. 

 Ophiocytium, Naeg. — O cochleare, A. Br., Ponds. - 



Eudorina, Ehrb. — E. elegans, Ehrb. 



DESMIDIACEAE. 



ClOSterium, Nitzsch. — C. Lunula, Muller. Common but not hereto- 

 fore noticed. — C. decorum, Breb. Not infrequent. 

 Pleurotaenium, Naeg.— P. coronatum, Breb.— P. Ehrenbergii, Ralfs 

 Spirotaenia, Breb.— S. obscura, Ralfs. Ponds, N. J. 

 Sphaerozosma, Corda.— S. secedens, De By., Brown's Mills, N. J. 



