ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 299 



Lijnyhijay After a shoi-t reference to previous work on the subject, 

 the author describes an active growth of a Z///e^%«-association, found 

 in the autumn of 1916 on a surface of mud which contained a consider- 

 able precipitation of FcoOg-gel, in an aquarium tank at Aneboda. 

 He identified the species as L. martensiana, although it differed in the 

 size of the sheath. Gradually a deposit takes place of granules of iron 

 oxide in irregulai' quantities on the sheath, attaining its maximum only 

 on dead individuals. The deposit is not connected in any way with tbe 

 activity of the Lynghya cells, but is purely chemical and mechanical. 

 Various stages of deposition and consequent malformation are figured. 

 A discussion on L. acliracm (Kiitz.) Thur. proves its identity with 

 Ghlamydothrix ochracea (Kiitz.) Mig., the latter name having the 

 priority. The author has not found his species of Lynghya again in 

 any of his further researches in localities where iron abounds, and be 

 concludes that it is a sporadic form. The formation of the well-known 

 forms of iron ore — ^' Bohnen " and " Gelderz " — are quite independent 

 of an algal substratum. E. S. G. 



Alg-ological Notes. — K. M. Str0m {Nyt May. Nat.-videmlc, 1921, 

 59, 14 pp. 1 pi.). The first contribution to a series of short notes on 

 algfe and plankton, 



I. Some Desmids from North Australia. — This is a list of species 

 of desmids found growing on algae, which themselves grew abundantly 

 on a tortoise from the lagoons near Daly River. Twenty-four species 

 are recorded, among them many rare ones, hitherto recorded only once 

 or twice. The collection is markedly of an Indo-Malayan and Austra- 

 lasian type. 



II. Fresh-ivater alyse and plankton from Finmark. — The algje were 

 from Skj0tningberg and Oksef jord in the extreme north of Finmark. 

 Twenty-seven species are recorded, only one of which, Enastrum crassi- 

 colle, has an essentially northern distribution. The plankton was 

 collected in Nedre Oksef jordvand, a lake of considerable size, in .luly 

 1920. It was rich and varied, and was of a striking Caledonian type. 

 Mallomonas acaroides, Dinoiryon diveryens, Staurastrum lunatum var. 

 planctonicum, and *S'. paradoxum occurred in great abundance. Among 

 the desmids, Pleurotseniimi ehrenheryii was present in the form described 

 bv Messrs. West from Loch Fadaghoda. 



III. The Germination of the zooyonidia of Stigeodonium temie.—The 

 process is described. The author finds that this alga very often survi^^es 

 the winter in a vegetative state, and her own experience is that perhaps 



. the greater number -of algse pass the winter without producing resting 

 spores. 



IV. Resting spores of Pediastrum. — These were collected in 1907 by 

 Dr. N. Wille at Lyng0r, a small fishing village in 8.E. N^orway. The 

 cells when dry looked like red sand, possibly owing to the presence of 

 hasmatochrom, and they contained a fat oil. The contents were sur- 

 rounded by a separate cell-wall. The resting form of Pediastrum must 

 therefore be regarded as an aplanospore, in the Wille sense. In Septem- 

 ber 1919 the material was • cultivated, and germinated into normal 

 Pediastrum colonies, after a lapse of twelve years. E. 8. G. 



