122G Conjugatae, DesraidiaceDe, Staurastrum. 



minus, processibus brevioribus, inferiori sursum directo, superiori 

 angulum rectum cum eodem efficiente; membrana levi, sine gra- 

 nulis, Ad « Junsai numa » Japonia?. 



224. Staurastrum Arctiscon (Ehrenb.) Lund. Desm. Suec. p. 70, t. 295-2 

 IV, f. 8, Wolle Desm. U. S. p. 148, t. 47, f. 9-10. Cooke Brit. 

 Desm. p. 179, t. 63, f. 1, Asteroxanihium arctiscon Kuetz. Spe- 

 cies p. 184, Staurastrum munitum Wood Proc. A. N. S. 1869, 

 Freshvi^. Alg. U. S. p. 154, t. 13, f. 13 verisimillime (sec. Wolle), 

 Xanthidium arctisoon Ehrenb. Verbr. p. 138, Xanthidium n. 2 

 Bailey in Sillim. Amer. Journ. of Sc. and arts vol. XLI, 1841, 



p. 291, t. III, f. 15. — Permagnum, modice constrictum, sinu ex- 

 trorsura valde ampliato; semicellulis subglobosis, paullum depres- 

 sis, sub dorso processibus senis oblique sursura versis, in media 

 parte novenis extrorsum directis coronatis, processibus omnibus 

 praelongis, sequilongis, subachrois, rectis, margine 4-denticulatis, 

 apice 3-fidis; a vertice visis 9-goniis, amplis, in processum prse- 

 longum, rectum, margine denticulatum, apice trifidum productis, 

 in medio processibus 6 similibus praeditis; membrana subtiliter 

 punctata. 



Hab. in stagnis in Suecia (Lundell), Hibernia (Cooke), Nor- 

 vegia (NoRDSTEDT, Wille), Germania (?Rabeniiorst), Lulea Lap- 

 pm. (Boldt), America boreali (Ehrenberg, Bailey, Wood, Wol- 

 le). — Long. s. process. 64 [j.., long. c. proc. 130 a. ; lat. s. proc. 

 48 p..; lat. c. proc. 130 a.; long. proc. 40-44 f^.; lat. isthm. 25 /m. 



225. Staurastrum ancyroides Wolle Desm. U. S. p. 137, t. 51, f. 3-4 2953 

 et in Hedwigia 1885, p. 118. — Fere seque longum ac latum, gra- 

 nulato-rugosum ; semicellulis cylindraceis, apice convexos versus 

 ampliatis; lateribus in processus laterales, angustos, elongatos, le- 

 niter conicos, incurvos, marginibus crenulato-granulatos, apicibus 

 bifurcatos porrectis ; semicellulis e vertice visis quadrangularibus, 

 4-radiatis. 



Tlah. in stagno pr. « Malaga » Now Jersey Araeric?e borealis 

 (Wolle). — Dimens. cell. 75 ^ 82. — Var. iiexacerum Wolle Desm. 

 U. S. p. 137, t. 51, f. 3: validius, processibus senis. In stagnis 

 New-Jersey Araericse borealis. — Varietas haec ad Staurastrum 

 coronulaium Wolle vergit. 



226. Staurastrum montanum Racib. De nonn. Desm. quse in Polonia 2954 

 inventa) sunt tab. III, f. II. — Mediocre, pauUo latius quam lon- 

 gius, profundissime constrictum, incisura mediana intus sublineari, 

 extrorsum valde ampliata; semicellulis e basi siibreniformi (plus 



