1158 Conjugatae, Desmidiacese, Staurastrum. 



Hab. a.d uCracoviam» Poloniae (Raciborski). — Dim. cell. sin. 

 acul. 26s24; lat. isthmi 9,5 pi.., latit. apic. 12 p., long. acul. dor- 

 sual. 7 fjL., long. acul. raed. 5, 8 fx. — Ex Nordstedt in litt. vi- 

 detur. — Staurastri furcigeri seu St. monticulosi varietas. 



57. Staurastrum Reinschii Roy in Journ. R. Micr. Soc. 1883, p. 196, 2785 

 Cooke Brit. Desm. p. 148, t. 51, f. 4, Hansg. Prodr. p. 213, Stau- 

 rastrum sp. Reinsch Contrib. Alg. Fungol. p. 86, t. 17, f. 5. — 

 Semicellulis e fronte visis late ovato-cordatis, apice late rotunda- 



tis, apicibus lateralibus truncato-auriculatis, spinis 2 brevibus ar- 

 matis, incisura acutangula extrorsum arapliata; e vertice visis 

 triangularibus, lateribus leniter convexis, angulis rotundatis, spina 

 singula recta instructis; raembrana aequaliter aculeis apice integris 

 vel bicuspidatis irregulariter dispositis ornata. 



Hab. in aquis stagnantibus in Anglia (Roy), Germania (Reinsch), 

 Suecia (s. Boldt) et ad a Veseli » socio (Edogonio crispulo var. 

 minuto in Bohemia (Hansgirg). — Dimens. 30 ^ 30. 



58. Staurastrum subcruciatum Cooke et Wills in Cooke Brit. Desm. 2?86 

 p. 148, t. 51, f. 3, Notarisia 1887, p. 339. — Minus, fere ita lon- 

 gum ac latum vel latius, sinu rectangulari, expanso; semicellulis 

 obverse triangularibus, angulis in spinaui breviter furcatara, hori- 

 zontaliter vel oblique directara abeuntibus; margine dorsuali conve- 

 xulo vel subplano, granulato, marginibus lateralibus convexulis gra- 

 nulatisque; membrana ad angulos granulata, granulis transversira 

 seriatis; a vertice visis triradiatis, angulis in spinara brevem ab- 

 euntibus, lateribus leniter concavis. 



Hab. in stagnis montanis « Capel Curig » in Carabria Britan- 

 niae. — Dim. 30 ^ (incl. spinis) 35 fx. Inter Staurastrum monti- 

 culosum Breb. et Staurasirum Reinschii Roy raedium. 



59. Staurastrum trifidum Nordst. Desm. Bras. p. 226, t. 4, f. 51, Hcd- 2737 

 wigia 1870, p. 186, Wolle Desm. U. S. p. 123, t. 40, f. 28-29, Hansg. 

 Prodr. p. 256. — Subparvura, circiter tara longura quara latura, 

 profunde constrictum semicellulis breviter cuneatis, sursum sensira 

 dilatatis, dorso leniter retusis, angulis superioribus obtusis in 3 

 aculeos parvos fissis; a vertice visis trigoniis, angulis truncatis tri- 

 fidis, lateribus lenissirae retusis, raembrana subtiliter punctata. 



Hab. ad «Lagoa Santa» in Brasilia Araericse australis (War- i 

 ming), in Pennsylvania, New Jersey etc. Araericoe borealis (Wolle); ( 

 ad «Magdalena» pr. « Wittingau » Boheraia) (Hansgirg); in Suecia. 

 — Diraens. 29 a 20,5-25 (sin. acul.); latit. c. acul. 33-41 p., constrict. 

 10 fji. (Nordstedt); latit, 30-50 ^., acul. circ. 9 f/. long. (Wolle, Hans- 



