Conjugata3, Desmidiacone, Staurastrum. 1233 



zygotis globosis, appendicibus basi incrassatis, superne furcatis, 

 proiditis. 



llab. \i\ stagnis in Britannia (Ralfs, Hassall, Cooke), Italia 

 (Dklponte), Gallia (Brebisson, Petit), Vogesis (Lemaire), Ger- 

 uiania (Rabenhorst, Kirciiner), Hungaria (Istvanffi), Belgio 

 (De-Wildeman), Rossia (Riabinine), Sibiria (Boldt), Suecia (Cle- 

 VE, Lundell, Wittrock), Norvegia (Nordstedt, Wille), Fen- 

 nia (Elfving), Lulea Lappin. et Groeniandia (Boldt), Dania (Ja- 

 cobsen); in Brasilia Aniericae australis (Nordstedt). — Dimens. 

 (excl. proc?) 14^:14 (Delponte), diam. cum proc. 22-47 p.., zygota 

 16 [>.. diam., cura spinis 30 ^. diam. (Kirchner). — Var. sinuatum 

 Wolle in Bull. Torrey Bot. Club vol. X, n. 2, p. 20, t. 27, f. 24, 

 Hedwigia 1883, p. 190: processibus aculeiforraibus magis diver- 

 gentibus, apicibus emarginatis. In America boreali (Wolle). 



242. Staurastrum odontatum Wolle Desm. U. S. p. 134, t. 43, f. 8-9 2970 

 et in" Hedwigia 1882, p. 77. — Seniicellulis e fronte visis qua- 

 drangularibus, dorso convexis, angulis superioribus in processus 

 laterales rectos vel leniter incurvos, latitudinem corporis longitu- 

 dine ajquantes, margine serratos apiceque furcatos productis, an- 

 gulis inferioribus leniter rotundatis, singulis aculeo brevi, firmo 

 instructis; e vertice visis quadrangularibus, 4-radiatis. 



Hab. in stagno «Splitrock, Passaic County» New Jersey Ame- 

 rica) borealis. — Dimens. 45:^62-75. 



243. Staurastrum ventricosum Delp. Specim. Desra. subalp. p. 155, 2971 

 t. XII, f. 39-41. — Cellulis dentato-aculeatis, tertia parte magis 

 longis qiiam latis, valde oonstrictis; semicellulis oblongo-ellipticis, 

 utrinque breviter attenuatis, cornibus rectis, parallelis, apice tri- 

 dentatis, e dorso oblongo-depressis, ambitu subrectangularibus, pr. 

 basin utrinque parumper angustatis; junctura vix quartam totius 

 cellulcT latitudinis partem aequante; isthmo vero nullo; e latere 

 visis cylindraceis, incrassatis , utrinque truncatis, medio modice 

 constrictis, e vertice visis fusiformibus, sensim angustatis. 



Hab. in lacu candiano Italia^ borealis (J. B. Delponte). — 

 Dimens. 36 s 54. 



244. Staurastrum leptocladum Nordst. Desm. Bras. 1869, pag. 218, 2972 

 t. IV, f. 57 et in Hedwigia 1870, p. 186, Wolle Desm. U. S. p. 136, 



t. 44, f, 4-5. — Mediocre; semicellulis subtriangularibus, dorso 

 latissirae rotundatis (aculeis parvis fragilibus prajditis?), paullo infra 

 dorsum tumore parvo instructis, lateribus crenatis, basi subglobo- 

 so-inflatis (tantum in statu divisionis cellulae?), angulis superiori- 



78 



