RECENT ADVANCES IN SCIENCE 45 



191 8), and Messrs. T. and T. A. Stephenson describe a new 

 form of Helleborine viridiflora from the Isle of Wight. The 

 former include members of the following genera : Polygala, 

 Thespesia, Scabiosa, Helichrysum, Senecio, Gazania, Wahlen- 

 bergia, Cyphia, Jasminum, Lindernia, Dyschoriste, Blepharis, 

 Barleria, Selago, Plectranthus, and Acrocephalus. 



Mr. Hornby {New. Phyt., Jan. and Feb.) describes a new 

 species of freshwater alga from Britain, viz. Endoderma 

 Cladophora. 



Fritsch has investigated collections of algae from the Cape 

 Peninsula, and describes numerous varieties and several new 

 species (Annals of the S.A. Museum, vol. ix. pp. 483-611). 

 Of these the most interesting are two new species of Ecballo- 

 cystis and Sphceroplea africana. The transverse septa in the 

 latter arise by the ingrowth of cellulose processes which in 

 many cases, and perhaps always, leave a central aperture, 

 so that it is an open question whether Sphceroplea is septate 

 in the true sense of the term. Scenedermus cohoerens, n.sp., 

 is a remarkable member of the genus in which the cells normally 

 adhere together to form large plate-like colonies of as many 

 as a hundred cells. 



The several interesting additions to the Cyanophycae 

 include Schizothrix polytrichoides, in which the trichomes 

 within the sheath of the principal branches may number 

 more than fifty, and often present a rope-like appearance, 

 and two species of Dichothrix. 



Apart from those mentioned above illustrations and diag- 

 noses are given of new species or varieties belonging to the 

 following genera: Schizochlamys, Coelastrum, Ulothrix, Stigeo- 

 clonium, Gongrosira, Cylindrocystis, Penium, Euastrum, Cos- 

 mariutn, Xanthidium, Staurastrum, Spondylosium, Zygnema, 

 Cylindrospermum, Euglena, and Trachelomonas. 



The Rev. W. Johnson (Naturalist, Mar. 191 8) records a 

 lichen new to Great Britain, viz. Sarcopyrenia gibba, from the 

 shore rocks at St. Bees, Cumberland. 



A new species of saxifrage (S. Drucei) and two new varieties, 

 S. Sternbergii v. gracilis and S. hypnoides v. robusta, are de- 

 scribed by Rev. E. S. Marshall, all from Ireland (Journal of 

 Botany, Mar.). 



Further species of Rubiaceae from New Guinea are described 

 by Dr. Wernham, belonging to the genera Uncaria, Dolicho- 



