1058 Conjugatse, Desmidiaceae, Artlirodesmus. 



Journ. Royal Micr. Society 1885, Decemb., ser. II, vol. V, p. 937, 

 pl. XVI, f. 17: seginentis subpyramidatis, aculeis rectis; Dim. (sin. 

 spin.) 30 s 25; long. spin. 16 [j.. Harvey Lake (Ara. bor.). An huc Ar- 

 Ihrodesmi Inci Hass. var. in Rabenh. Fi. Eur. Alg. III, p. 226? 



2. Arthrodesmus convergens Ehrenb. Inf. p. 152, n. 176, t. X, f. 18, 2545 

 Ralfs Brit. Desmid. p. 118, n. 1, t. XX, f. 3, Rabeuh. Alg. n. 341 



et 127! et Dec. 185, n. 1227 b, Cleve Bidrag p. 489, n. 1, Perty 

 Kl. Lebensf. p. 209, Focke Phys. Stud. II, t. IV, f. 14, Rabenh. 

 Bacill. n. 51, Rabenh. Fl. Eur. Algar. III, p. 227, Kirchn. Alg. 

 Schles. p. 156, Cooke Brit. Desm. p. 136, t. 47, f. 1, Wolle Desra. 

 U. S. p. 95, t. 23, t. 19-21, Siaurasirum convergens Menegh. in 

 Linn. 1840, p. 228, n. 16, Euasirum [Tetracanthium] convergens 

 Naeg. Einz. Alg. p. 114, t. VII, C. f. 1, Xanihidium convergens Del- 

 ponte Specim. Desra. subalp. p. 172, t. 14, f. 13-23, Arthrodesmus 

 obsolelus Hantzsch in Rabenh. Alg. n. 1407. — Levis, mediocris, 

 profunde et anguste constrictus, 38-42 ^ 40-46, isthmo circ. 12 //. 

 lato, aculeis convergentibus armatus; semicellulis ellipticis vel 

 ovato-oblongis, nonnunquam reniformibus, utroque fine aculeo longo, 

 firmo, incurvo instructis; zygotis levibus, orbicularibus, ad 44 fx. 

 diani. 



Hab. in fossis stagnisque (etiam in aquis calidis) in Britannia, 

 Gallia, Belgio, Hungaria, Rossia, Fennia, Germania, Suecia, Nor- 

 vegia, Dania, Sibiria, Nova Semlia, Italia, Bohemia, Japouia, Ame- 

 rica boreali et insula Java.-- Cellulae 93 ^ 58 ex Delponte. Specimina 

 ex insula Java sec. Nordstedt De Algis et Char. p. 12 prcebent di- 

 mensiones sequentes: longit. 50 a., latit. 46 tj.., crassit. 24 //., long. 

 acul. 8-10 u.. 



3. Arthrodesmus orbicularis Wolie in Hedwigia 1883, p. 190, Desm. 2546 

 p. 96, t. 24, f. 15-16.— Minutissimus, levis, orbicularis ; semicel- 

 luiis isthmo angusto conjunctis; aculeis semicellularum subparal- 

 lelis. 



Hab. in stagnis ad Montera «Everett» Massachussets Americae 

 borealis (Wolle). — Diam. cell. (sine acul.) 12 p.. 



4. Anthrodesmus tenuissimus Archer in Micr. Journ. 1864, p. 175, 2547 

 t. VI, f. 50-55, Rabenh. FI. Eur. Algar. III, p. 226, Lundell Desm. 

 Suec. p. 55, Cooke Brit. Desm. p. 137, t. 47, f. 3. — Minutissi- 

 raus, levis, paulo latior quam longior, utrinque late et obtuse si- 

 nuatus; semicellulis subhexagoniis , angulis lateralibus oppositis 

 cuspidatis, augulis superioribus mucronulatis; a vertice in utro- 

 quo polo mucronibus rectis vel divergentibus. 



