NOTES ON BRITISH DESMIDIE^. 301 



Closteriwn Kutzingii, Breb. — Goole, Yorkshire. 



C. calospornm, Wittr. — One example only ; among other 

 Desmids from Aberdeenshire. 



C. aciitiim, Lyngb. — Rain-water pool, Driffield Woods, near 

 Cii'encester. 



C. gracile, Breb. — Penzance. 



C. suhulatum, Kiitz. 



C. intermedium, Ealfs. — Abundantly conjugated with other 

 AlgaB, Fyvie, Aberdeenshire. Zygospores rare. 



C. monilifenun, Bory. — Cirencester. 



C. Leibleinii, Kiitz. — Cornwall. 



C. rostratum, Ehr. — Devonshire. 



C. coniu, Ehr. — Minety, Wilts. 



Micrasterias Thomasiana, Archer. — Fyvie, Aberdeenshke. 

 Zygospore globose ; spines forked ; resembling that of M. denti- 

 culata ; one specimen only. The first instance of its occurrence. 



Gonatozijgon Brebissonii, De Bary — Tudmoor, Cirencester. 



SphcBrozosma excavatum, Ralfs. — Hulgarvon Moor, Bodmin. 



Hyalotheca dissiliens, Sm. — Goole, Yorkshire ; also, curiously 

 conjugated in filaments, after the manner of Didijmoprium Borreri, 

 Fyvie, Aberdeenshire. 



Euastrum elegans, Breb. — Large form ; typical. Minety, Wilts. 



E. oblonginn, Grev. — Minety, Wilts. 



E. ansatiun, Ehr. — Aberdeenshire. 



E. decedens, Reinsch. — Minety, Wilts. 



Cosmarium tetraopthalmum, Breb. — Small form. Cirencester. 



C. bioculatum, Breb. — Cirencester. 



C. Meneghinii, Breb. — Driffield Woods, Cirencester. 



C. corbula, Breb. — Driffield. 



(7. truncateilum, Perty. — Fyvie, Aberdeenshire. Zygospore dis- 

 tinguished fi'om that of C. pygmaum, Arch, (which the plant 

 somewhat resembles), by its minute hair-like spines. 



C. melanosporum, Arch. — Cornwall. (Not yet described). 



C. tmctiwi, Ralfs and C. margaritiferum, Ralfs. Penzance, 

 Tremethic Moor. 



C. Brebissonii, Menegh. — Tremethic Moor, Penzance. 



Staurastrum muticum, Breb. — Penzance. 



S. aspermn, Breb. — Bodmin. 



S. 2^i^>'os})orum, Lund. — Penzance, Aberdeenshu'e. Dis- 

 tinguished from S. O'Mearii, Arch, by its quadrate zygospore. 



S. dejectum, Breb. — Cornwall ; Aberdeenshire. 



S. dejectum, Breb., /3. apiculatxim, Breb. — Penzance. 



S. pijgm(sum, Arch. — Bodmin. 



S. Dickiei, Ralfs. — Penzance. 



Tetmemorus granidatus, Ralfs. — Fyvie. 



T. IcBvis, Kir by. — Minety, Wilts. 



Penium. minutissimiim , Reinsch. — Banchory, J. Roy. 



Cylindrocystis diplospora. — Small form. Dalbrake. Banchory, 

 J. Roy. 



C. Brebissoni, Menegh. — Cornwall. 



Penium phymatosporum, Nords., ' Desm. et (Edog. ab 0. Nordstedt 



