1150 Conjngatce, DesniidiacG?e, Staurastrum. 



Hab, in fossis, fodinis tiirfosis Germani;e (Kuetzing), ad «Le- 

 highVall.» in Pennsylvania Araericae borealis (Wolle). — Diara. 

 cell. excl. spin. 3j-33 [j.. (Wolle); diuiens. 40-45^50 (Raben- 

 horst). 



36. Staurastrum corniciilatum Lund. Desm. Saec. p. 57, t. III, f. 23 276 1 

 et in Hedwlgia 1873, p. 103. — Meliocre, diametro quinta vel 

 quarta parte longius, medio utrinque emarginatura obtusangula 

 leviter emarginatum ; seraicelhilis subcuneatis, e basi latiuscula 

 sensim dilatatis, lateribus subconvex.is, margine dorsuali recfco, aa- 

 gulis (superioribus) obliqne sursum angustato-protractis, obtusis; 

 a vertice visis triangularibus, lateribus rectis, angulis obtusis; mera- 

 brana glabra; latitudine isthmi cellulae latitudinera dimidiam sequan- 

 te vel paullulo superante. 



Hab. ad «Bergsbrunna» in Uplandia Sueciaa (Lundell), in Lu- 

 lea Lappm. (Lagerheim); in Japonia (P^oy, Bisset). — Dimens. 

 cell. 36-42^30-33, lat. isthmi 17 a. Species habitu inter S. pileo- 

 latum Breb. et S. Clepsydra Nordst. fere interraedia. — Var. va- 

 riabile Nordst. Freshw. Alg. of N. Zeal. and Austral. p. 39, tab. 

 4, fig. 17, Botaniska Notiser 1887, p. 158, Notarisia 1888, p. 409: 

 angulis seraicellula3 paullo minus protractis interdum acutiusculis 

 (vel paullulo mucronatis vel obtusiusculis), lateribus raedio levissirae 

 concavis, semicellulis e vertice visis lateribus medio levissime conve- 

 sis. In Nova Zelandia (S. Berggren). — Dimens. 30-34 =* 28-32, latit. 

 isthmi 16 u.. Staurastro leptoclermo Lund. subaffine, etiam cura 

 Staurastro connato var. Spenceriano et Staurastro Clepsydra 

 Nordst. conparandum. 

 •37. Staurastrum subteliferum Roy et Bisset On Japanese Desraids 2765 

 p. 238, tab. 269, f. l, Notarisia 1886, p. 192. — Medium, aliquan- 

 tulum diametro longius; semicellulis e fronte visis regulariter 

 ovatis, in quoque latere 3 validas spinas, in superficie 2-3 similes 

 et circa apicera 2 parvas gerentibus, e vertice visis triangularibus, 

 angulis in 3 validas spinas terminales nec non in 2 laterales ab- 

 euntibus; in media parto trianguli 9 spinis in orbem dispositis ex- 

 tantibus; lateribus concavis, sinu profundo, acuto, extrorsura am- 

 pliato; merabrana levi. 



Hab. ad «Junsai nuraa» Japoniae. — Dim. 37^35, lat. isthrai 

 13 ;/. 



38. Staurastrum tridentiferum WoUo Desra. U. S. p. 142, t. 45, f. 9-10. 2766 

 — Minutum, leve, sinu araplo; soraicellulis ellipticis, dorso plus 

 minus convexo, angulis aculeos 3 firmos, divergentes gerentibus; 



