1230 Conjugata3, Desmidiaceoe, Staurastrum. 



— Magiium, gfaimlato-rugosum ; semicellulis e fi*oute visis subcu- 

 neatis, basi truucatis, apice rotundatis; angulis superioribus late- 

 raliter iu processum longum, leniter pyraraidatum , rectuni vel 

 curvum, raargine serratura, apice bifidum productis; e vertice visis 

 G-radiatis, 



Hah. in stagnis New-Jersey Americas borealis; in ins. Cuba (La- 

 gerheim). — Diara. 150-180 fx. Slaurasiro Ophiurce Luud. pro- 

 ximum. 



233. Staurastrum Rotula Nordst. in Warm. Syrab. Fl.Bras.Desra. 1869, 2961 

 p. 227. t. IV, f. 38, Hedw. 1870, p. 186, Wolle Desra. U. S. p. 135, 



t. 44, f. 13-14 (forraa majus), Lagerh. Alg. Bidr. II, p. 198. — 

 Subraagnum, profundissime constrictura; semicellulis subhexagoniis, 

 dorso truncato dentibus paucis munito, angulis lateralibus in ra- 

 dium longum, rectura, ad apicera trifidum paullulum angustatum, 

 margine 3-4 processibus dentiformibus prasditura productis; semi- 

 cellulis a vertice visis 7-9-radiatis, radiis strictis, apice trifidis, 

 margine dentato-crenatis, singulis ad basin graaulo unico prseditis, 

 in medio punctatis. 



Hab. ad u Lagoa Santa » in Brasilia Araerica3 australis (War- 

 ming); ad uFajardo, Puerto Rico» (Lagerheim); in New Jersey et 

 Pennsylvauia Araericfe borealis (Wolle). — Longit. 48 a, ; latit. s. 

 rad. 15,5-21,5 a. ; latit. c. rad. 77-96 ix.; lat. isthmi 11,5 a. (Nord- 

 stedt); Diam. 88-125 a. (Wolle). 



234. Staurastrum coronulatum Wolle Desm. U. S. p. 135, t. 44, f. 11- 2962 

 12. — Duplo longius quam latius; seraicellulis obovatis, lateribus in 

 processus paullulum conoideos, incurvos, margine dentatos porrectis, 

 apicibus convexis, dentes 6 coronse ad instar dispositos oblongos 

 gerentibus ; e vertice visis 6-radiatis, raarginibus subtiliter ser- 

 rato-denfcatis, apicibus tridentatis. 



Hab. in stagnis aPassaic County » uec non pr. aMalaga» New- 

 Jersey America^ borealis. — Diam. cell. 75-85 a. S. Rotuloc Nordst. 

 proximum. 



235. Stanrastrum pentacladum Wolle Desm. U. S. p. 136, t. 43, f. 15, 9963 

 t. 44, f. 15-16. — Forraa quasi Slaurastri coronulati Wolle, ra- 

 diis (e vertice) 5 gracilioribus, corpore rainori, apicibus magis pa- 

 tentibus. 



Hab. in stagnis aGilder» pr. (( Mont. Everett» Massachussets, 

 nec non in New-Jersey et Pennsylvania America3 borealis. — 

 Diam. 40-47 a. 



236. Staurastrum minutulum Josh. On some new and rare Desmids in 964 



