KONGL. SV. VET. AKADEMIENS HANDLINGAR. HAND 25. N:0 5. 167 



4. Spirotaenia? sp. 



Endochrome nearly destroyed; two specimens only. 

 Long. 70—76, lat*. 10.5—12 //. T. XXIII, f. 15. 

 I Ii mala vas? J. S. 



5. Closterium crassestriatuni? Archer (in Proc. Dubl. Micr. Club 1878, in Q. Jl. Mic. 

 Sci. [). 120, 1879), forma? 



Described by Archer as very robust, considerably curved, and very strongly 

 striated, the striae (costae?) few. Nearest to CL costatum Corda, which species the 

 New Jersey (IT. S. A.), Seotch and Irish specimens exactly resembled. Not ventrally 

 inflated. Zvgospore large, smooth, suborbicular and thiek-walled, seemingly not at all 

 remaining attached to the parent cells. Specimen from New Jersey. 



This form mav be thus described: 



Cl. semilunare, turgidum, utro(|iie apice valde attenuatum, medio vix inflatum, 

 apicibus truncato-rotundatis, striis transversis medianis 2 — '■'>, costis longitudinalibus 

 9—11 evidentissimis: membrana fusco-luteola. 



Long. 326—382, lat. max. 49—58 fi. T. XXIII, f . 8 X 250. 



I first saw this at Bowness, Engl. in 1885, but until lately I considered it as 

 only a var. of < '. costatum, however, on comparing 2 Indian specimens with t hat spe- 

 cies, I think it must be considered as distinct therefrom; the costae are interrupted at 

 the median fascia. 



Ib///. [England]; Himalayas, from Utricularia stellaris, G. v. L. 



(On submitting iigure of this form to Mr. Archer, he kindly informs me that 

 it is verv close to, if not identical with, his Cl. crassestriatum). 



6. Micrasterias rotata (Grev.) Ralfs, f. evoluta, n. f. 



Forma latiuscula, laciniis apertis, lobulis bicuspidatis, lobo polari ornato exserto. 

 Specinien unieum observavi. 



Long. 282, lat. 262 />. T. XXIII. f. 1 X 425. 

 Tliough Wallich reports this sp. from Bengal (vide No. 9 under the genus) I did 

 not see it in his material. This form nmch resembles one sent me years ago by Mr 

 Wolle from America, but it is smaller and not so deeply incised. E. Bengal, ex Utri- 

 cularia flexuosa, C v. L. 



Xotr. As I tind in the interim that the name C gradatum has been appro- 

 priated by my friend Mr. Rov (I)esm. Alford Dist. p. 203) for another Cosmarium, I 

 alter the name of my plant p. 68 to C. scalare. 



Finallv, I venture to express my sense of the great indebtedness of British Algo- 

 philes to Scandinavian authors, whose great erudition is only equalled l)^' their courtesj 

 and generosity. W. 1>. T. 

 12 Oct. 1892. 



