KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:0 5. 157 



Gen. 5. Hydrocystis (gen. ad interim). 



1. H. hydrophila, n. sp. Cellula sphserica achroa hyalina, supra superficiem cellulas reni- 

 forracs vel elongatas virides (apiee saepe brunneas vel purpurascentes) adpressas ferens. 

 Cellnia in centrali parte nucleata, ut Cl. Walliehio visa; interne mucosa? 



Diam. cell. 72; long. cell. exter. 28—57, lat. 20—25 ju. T. XX, f. 27 X 200 

 after Wallicii Mscr. 332 A. 



Baboosole, Oct. 1855. 



Gen. 6. Gloeocystis, Näg. Einz. Alg. p. 65. 



1. G. sp. G. vesiculosce Näg., 1. c. accedens sed paullo major. 

 Central India. 



Gen. 7. Botryococcus, Ktz. Spec. Alg. (Appx.) p. 892, 1849. 



1. B. Braunii, Ktz. 1. c. 



Malabar, ex Ltricularia stel lar i, G. v. L. 



Gen. 8. Gloeotaenium. Hansgirg 



in Sitz.-bcr. d. K. Bohm. Ges. p. 10, 1890; Nova Notarisia, pp. 264-5, 1800; Stockmaykr in Sitz-ber. K. K. 



Zool.-bot. Ges. Wien, Bd. XLI, 1891, c. icones. 



1. G. Loitlesbergerianum, Haxsg. 1. c. Wallich Mscr. 340, 343. 



Dr. Wallich says, »The cell has two membranous coats, one hyaline and conti- 

 nuous, the other (opaque) with apertures in it made by a broad central band. In 

 front view (a b) the apertures are elliptical; in side view (cd) of verv paradoxica 

 form, in this view the bands are continued upwards, with truncate extremities, pro- 

 longcd and rounded at the central portion of the ends.» . . . »The cell having burst 

 and discliarged its contents, by rupture of the junction of one longitudinal band at 

 each or either side of the transverse band (e) the spore cells (f) are ejectcd. These 

 are 5 or 6 in number, each having a projecting process attached; and being partially 

 filled with green grannlar endochrome.» In original cell 2 endochrome masses. The 

 outer membranous coat is purple or purplish-brown, the cell-contents are vivid green, 

 in colour. 



Long. 48, lat. 25 — 33; spores long. 9, lat. 8 //. 



The plant figured by Wallich conforms wel] with the 2-celled form of Stock- 

 mayers description, 1. c. 



T. XXI, f. 12, after G. C. W. 



It seems verv debateable as to what position in classification this Alga shall take 



but observers will hardly aarree with the existing snjnrestion that it is near to 



Spirotcenia (or an} - Desmid); the name of the new Order, proposed to include it, 



Pseudodesinidiacece, is, to say the least, rather misleading. In all probability it is 



nearer to Gloeocystis and Tetraspora than to the Desmidieae. 



