Conjugatuo, Desmldiacese, Staurastrum. 1229 



radiorum aculeis longioribus ornatis. In turfosis prope ((Cserna» 

 Hungarige. — Diani. cell. 48 a. — Cfr. etiam var. hirtum Nordst. 



229. Staurastrum Arachne Ralfs in Transact. of the Bot. Soc. of 2957 

 Edinb. II, 1, p. 143, t. XIV, f. 6, Brit. Desm. p. 130, t. XXllI, 



f. G, Br(3b. Liste p. 139, Rabenh. Krypt. Flor. v. Sachs. p. 191. 

 Fl. Eur. Algar. III, p. 210, Wolle Desm. U. S. p. 129, t. 4?, f. 38- 

 42, Cooke Brit. Desm. p. 182, t. 63, f. 4, Kirchn. Alg. Schles. 

 p. 1()S, Gomocf/slis (Peniasterias) Arachnis Hassall Freshw. Alg. 

 p. 355, n. 1, t. LXXXV, f. 8, Phycastrum Arachnc Kuetz. Spec. 

 Alg. p. 181, n. 21 et Ph. radiatum Kuetz. 1. c. n. 22, Penia- 

 sterias radiata Ehrenb. Ablh. 1840. — Parvum, gracile, granulato- 

 asperum, (granulissuborbicularibus, minutis); semicellulis introrsum 

 ventricoso-globosis, angulis superioribus in cornu gracile, incur- 

 vum, apice obtusum olongatis, a vertice pentagoniis, quinque-radia- 

 tis, radiis elongatis, linearibus, achrois, obtusis, rectis vel leniter 

 curvatis, asperis. 



llab. in staguis in Gallia (Brebisson), Britannia (Ralfs, Has- 

 SALL, Cooke), Germania (Rabenhorst, Kirchner), Suecia (LuN- 

 dell), Norvegia (Nordstedt), Dania (Jacobsen), Fennia (Elfving), 

 America boreali (Wood, Wolle), Sibiria et Groenlaudia (Boldt), 

 Japonia (Roy, Bisset). — Diam. cell. 40-50 y..; longit. proc. 14 [x. 

 Specimina groenlandica, teste Boldt Studier p. 37, formam sistunt 

 minorem, dimens. 19,2 = 28,8, lat. isthmi 3,4 fx. praebentem. 



230. Staurastrum comptum WoIIe Desm. U. S. p. 129, t. 42, f. 43-44. ^958 



— Parvum, granulatum; semicellulis subfusiformibus, apicibus con- 

 vcxis, processubus plus miuus convergentibus, isthmo elongato, cy- 

 lindraceo, paullo tumido discretis, centro costatis ; e vertice visis 

 6-radiatis, radiis rectis, apice tricuspidatis. 



Hab. in stagnis New-Jersey Americse borealis. — Dimens. 40-50 

 ^ 30-40. 



231. Staurastrum incisum WoIIe Desm. U. S. p. 132, t. 41, f. 12-14. 2959 



— Granulatum, marginibus serrato-dentatum; semicellulis e fronte 

 visis cuneatis, basi lata, lateribus ad apicem versus divergentibus, 

 parte superiori in quoque latere in processum brevem, obtusum, at- 

 tenuatum producta; e vertice visis 5-6-radiatis, radiis basi latis, 

 sa?pe ad apices obtusos attenuatis, lateribus serrato-dentatis, radiis 

 incisura acutangula vel liueari a basi lata discretis. 



Hab. in stagnis imprimis ad (( Splitrock » New Jersey AmericcG 

 borealis (Wolle). — Diam. 35-40 [j.. 



232. Staurastrum macrocerum WoIIe Desm. U. S. p. 134, t. 43, f. 3-5. 296o 



