200 SUMMARY OF CURRENT RESEARCHES RELATING TO 



New Plankton Species of Raphidium, R. spirochroma. — L. 



Reverdin {Bull. Soc. Hot. Geneve, 1917, 9, 48-51, fig. ; see also Bot. 

 Centralbl., 1918, 138, 262). The precision of the spiral chromatophore, 

 the visibility of the nucleus, and the form of the cell make a very well- 

 marked species, even among those species of Baphidiwn which have 

 pyrenoids. It may be necessary later to transfer it to the author's new 

 genus, Glosteriospira, and to form a new group of Raphidium comprising 

 species which possess pyrenoids and a well-defined spiral chromatophore. 

 In such a group several species of Spirotsenia would naturally find their 

 place. The name of Spiroraphideje is proposed for this new series in 

 the genus Raphidium. R. spirochroma was collected in the Lake of 

 Geneva, almost on the surface, between Ariana and Port Noir. 



E. S. G. 



Phytoplankton of the Inland Lakes of Wisconsin. Part I. — 

 G. M. Smith {Wisconsin Geoloy. and Nat. Hist. Survey, Madison, 1920, 

 Bulletin No. 57, Scientific Series No. 12,243 pp., 51 pis,). This volume 

 deals with the Mysophycea^, Phaeophycefe, Heterokontse, and Chloro- 

 phycese, exclusive of the Desmidiacete. Investigation was begun in the 

 autumn of 1913 and continued during the summers of 1914-15-16-17. 

 In the introduction the author discusses the geography and geology of 

 Wisconsin, chemical composition of the lake waters, methods of collection 

 and study, an^ lakes studied. Available data on location and size of the 

 lakes visited during the course of the investigation are given in tabular 

 form. The systematic treatment is preceded by a key to the genera 

 based upon the vegetating characters. Diagnoses are given for the 

 Class, Order, Family, Genus and Species, together with keys to the 

 genera and species recorded. Critical notes are appended to some of the 

 diagnoses, which, together with the references to literature and the 

 numerous figures made from living material, should eliminate errors in 

 determination, E. S. G, 



Note on certain Species of Fresh-water Algae new to the 

 Spanish Flora, — C, C. Latorre {Bol. R. Soc. Espaji. Hist. Xat., 1920, 

 20, 333-6, figs, in text). The species in question were collected in 

 Portillo, Toledo, and include one new species, Gharacium setiferum, which' 

 much resembles G. apiculatum., but difPers in having a very long seta at 

 the apex of the mature plant, exceeding in length one-third of the cell. 

 The other species are Anahsena oscillarioides Bory (which has lieen men- 

 tioned as occurring in Northern Spain), Nostocrivulare Kiitz., Glosterium 

 lanceolatum Kiitz., Fediastrum Boryanum Turp., Gharacium strictum 

 A, Br,, and Vaucheria De-Baryana Woron. Figures are given of the 

 two last and of the new species. The extremes in size of Gharacium 

 strictum are shown. Intermediate sizes have been observed, which pro- 

 hibit separation into distinct species, E, S. G, 



Cytology and Systematic Position of Porphyridium cruentum 

 (Naeg-eli). — M. Staehelin {Ber. Deutsch. Bot. Gesell., 1917, 34, 893- 

 901, fig. ; see also Bot. Gentralbl, 1918, 138, 262). The chromato- 

 phore of Porphyridium is figured as a closed capsule lying along the 

 periphery, such as has only been recorded hitherto for Cyanophycege. 



