192 ' Transactions of the Societij. 



VI. — List of Desmidiese found in gatherings made in the neigh- 

 hourhood of Lake Windermere during 1883. 



By J. P. BissET. 



{Read 9th January, 1884.) 



Plate V. Figs. 4-7. 



In April last Mr. James Bisset, of Yokohama, then temporarily 

 residing at Bowness, sent the writer squeezings from marshy 

 ground in the following localities, viz. : — Moor near the farm of 

 Lindeth, Bowness, and on Brantfell ; also from the neighbourhood 

 of Claife Heights and Blea Tarn, These gatherings proved rich in 

 Desmidiese, producing among other interesting forms the beautiful 

 Mierasterias hrachyptera of Lnndell, not previously recorded out of 

 Sweden and Norway. The writer subsequently visited the same 

 district, and made gatherings at Lindeth, through Easedale, and in 

 the neighbourhood of Angle Tarn and Low Tarn. The follow- 

 ing list gives the forms detected in the two sets of gatherings, and 

 bears evidence that the English Lake District is likely to be found 

 a very prolific field for these beautiful organisms. 



Some particulars and figures are given of supposed new forms 

 found in the gatherings, but which had previously been found in 

 Scotland by the writer and his co-worker, Mr. John;^Eoy, of 

 Aberdeen. 



The following authorities are quoted for forms named, or figured, 

 since the publication of the last English work on Desmidiese, viz. 

 by Mr. Archer, in Pritchard's ' Infusoria.' 



Archer, Dublin Nat. Hist. Eev. = W. Archer, Dublin Natural History Keview 



1859. 

 Archer, Dub. Mic. Club Proc. = W. Archer, Dublin Microscopical Club Proceed- 

 ings, 1868. 

 De Not. Desm. Ital. = G. De Notaris, Elementi per lo Studio delle Desmidiacee 



Italiche. Geneva, 1867. 

 ■Jacobsen, Desm. Dane. = M. J. P. Jacobsen, AperQu Systematique et Critique 



sur les Desinidiacees du Danemark. Copenhagen, 1874. 

 Lundell, Desm. Suec. = P. M. Lundell, De Desmidiaceis quse in Suecia iaventse 



sunt, Observationes Criticse. Upsalise, 1871. 

 Nageli, Gatt. einzell. Alg. = 0. Nageli, Gattungen einzelliger Algen. Zurich, 



1849. 

 Nords. Desm. Spets. = O. Nordstedt, Desmidiacese ex insulis Spetsbergensibus 



et Beeren Eiland in expeditionibus 1868 et 1870 Suecanis collectse. Stockholm, 



1872. 

 Nords. Norges Desm. = O. Nordstedt, Bidrag till Kanuedomen om Sydligare 



Norges Desmidieer. Lund, 1873. 

 Nords. Desm. Arct. = O. Nordstedt, Desmidiese Arctofe. Stockholm, 1875. 

 Nords. Desm. Bras. = C. F. O. Nordstedt, 18 Fam. Desmidiacee, Symbolse ad 



Floram Brasilife Centralis cognoscendam, edit. Bug. Warming. Kjobenhavn, 



1869. 



