PLANTS OF RHODE ISLAND. 107 



4. varians, (Hass.) Kg. Roger Williams Park, &c. 



5. quinina, (Ag.) Common. 



6. communis, (Hass.) Kg. Providence, &c. 



Zi/ynona catenceforme, Hass. Alg. Ehod. No. 9."). 



7. longata, (Vauch.) Kg., & vars. 



Zyi/nehia )i}alformatum, Hass. Alg. Rhod. No. 94, in part. 



8. nitida, (Dillw.) Link. Geneva Pond. 



9. setiformis, (Roth.) Kg. Common in ponds; Providence, 



Mr. Lathrup. 



10. adnata, Kg. Providence, Mr. Lathrop. 



11. rivularis, Rab. Providence, Mr. Lathrop. 



ZYGNEMA, Ktz. 



1. leiospermum, D. By. Geneva Pond. 



2. insigne, Kg. Providence. 



Tijiidaridea, —, Hass. Alg. Rhod. No. 100. 



3. stellium, Ag. Common, 



var. genuinum, Kirch. Common, 



var. Vaucheria, Ag. Providence. 



Tyndaridea btcornis ? Hass. Alg. Rhod. No. 99. 



var. stagnale, Ky. Common. 



4. anomalum, (Hass.) Kg. Quidnesset, &c. 



var. crassum, Wolle. With the typical form. 

 ZYGOGONIUM, Kg. 



1. pectinatum, Kg. Quidnessett, &c. 



2. decussatum, (Yauch.) Kg. Davisville Brook, &c. 



MESOCARPUS, Hass. 



1. parvulus, (Hass.) D. By. Providence, &c. No. 101. 



2. radicans, Kg. Blackamore Pond, &c. 



3. nummuloides, Hass. Pi-ovidence, Mr. Lathrop ; Pocas- 



set, &Q. 



PLEUROCARPUS, A. Br. 

 mirabilis, A. Br. Common. 



STAUROSPERMUM, Kg. 



1. capucinum, Kg. Providence, &c. 



2. viride, Kg. Providence, Mr. Lathrop. 



Desmidiecv. 

 HYALOTHECA, Ehrh. 



1. desiliens, (Sm.) Breb. Common. No. 114. 



var. hians. Quidnessett, &c. 



2. mucosa, (Mert.) Ralfs. Spectacle Pond, &c. No. 115. 



3. dubia, Kg. Mashapavig. 



BAMBUSINA, Ktz. 

 Brebissonii, Kg. Common. 



Didyiitviyrium Borreri, Ktz. Alg. Rhod. No. 117. 



