12 HENRIK PRINTZ [1920 



passed by the mother membrane, rather thick-walled and charac- 

 teri'Stic by theiir chronialophoires. 



The species occurs in the samples 83, 94, 134, 167, and 168. 



Phaseolaria nov. gen. 



Cellnlae ovales vel fabifonniter ciirvalae, acervatim consociatae, 

 lihcrac, non inter se coalitae. Membrana cellularum ienui, glabra 

 vel levissime cremilata. Chromatophorum parietale, campamila- 

 tum, omnino vel fere omnino parietem interiorem oblegit. Pijre- 

 noidibus nullis. Niicleus cellnlae unicas, centralis. Propagatio 

 zoosporis contentn cellnlae maternae succedanee diviso ortis, 

 membrana materna dirupta liberis. Species duae adhuc cognitae 

 algae acris. 



Phaseolaria obliqua nov. spec, [PL I, Fig. 52 — 781. 



Cellnlis elongatis altera parte convexa altera minus convexa, 

 recta vel concava, unde cellnlae fabiformes vel reniformes, polis 

 late rotundatis, oriuntur. Polo altero cellularum vulgo crassiore et 

 magis rotnndato quam altero angustiore et magis acuminato. Mem- 

 brana tennis et levis vel interdum leviter crennlata, incrassationibus 

 non instrncta. Cellulis vegetativis adultis 8 — W u, raro nsque ad P2 jn 

 longis et % — % angnstioribus. Cellulis aetate magis provectis 

 zoosporas continentibus distentis et tumefactis vulgo aliquanto 

 majoribus et inflatis usque ad 16 a longis. Chromatophoro uno 

 campanulato parietem interiorem totum cellnlae obtegente vel raro 

 uno tatere incisura achroa instrncto. Zoosporis stigmate distincto 

 instructis. 



The genus Phaseolaria described here, is no doubt nearly related 

 lo Chlorococcum Fries, as it is mainly the shape of the cells only 

 Ihat dis-tinguishes these two genera, and they probably iorm a series 

 of evolutions corresponding to Chlorella-Oocijstis-Neplu-ocijtium 

 m the family of Oocijstaceae. The especially distinctive feature of 

 the genus Phaseolaria iis that the cells are oblong, ovate-cylindric 

 of a bean- or reniform shape. One side of the cell is usually more 

 tumid than the other, which may be nearly straight, at times 

 even conoave, whereby the oells aisisume a somewhat varying shape, 

 bean-reniform or cylindric to nearly hemispherical, with 

 broadly rounded ends. The membrane is thin, without polar nodu- 

 lar thickenings, usually glabrous, sometimes — as may also be the 

 case with most of the other subaérial algae — siightly crenulate. 

 The chromatophore is a single parietal slab, lining almost the whole 

 of the cell-wall. A pyrenoid is wanting. In the cells are frequently 

 to bei found some darker spots, which probably are products of 

 metabolism, but the nature of which I have not had occassion to 

 examine more closely. The nucleus is single, centrally situated. 

 The asexual reproduction is done by zoospores, formed by repeated 



