Algx of the English Lake District By Wm. West. 721 
P. interruptum Breb. Hk. 
P. closterioides Ealfs. W., S., Hk., near Cocker month, 
forma interrupta. 
Forma massa chlorophyllacea in partibus qnattuor divisa. 
Long. 122-125 /x; lat. 24-26 p. Black Sail Pass. 
P. Navicula Breb. Bo., Hp., W., L., C., Buttermere. 
Forma Wille (Bidrag til Kundsk. om Norges Ferskv. 
Alg., p. 49, t. ii. f. 32). Bn., H., Langdale. 
P. curtum Breb. 
forma minor Wille. H. 
forma minuta. 
Long. 22 p j lat. 10 ’5 p\ lat. isthm. 10 p. C. 
P. truncatum Ealfs. C. 
P. didymocarpum Lund. 
Long. 31-34 p ; lat. 13-14 p ; long, zygosp. 22-24 p ; 
lat. zygosp. 31-33 p. Hk. 
P. polymorphum Perty. Hp., Hk., Buttermere, Grisedale Tarn, 
Scarf Gap Pass, Brandreth, Blea Tarn in Borrowdale. 
P. Clevei Lund. 
Long. 96 p ; lat. 42 p ; lat. isthm. 39 p. Bn. 
P. cucurbitinum Biss. H., Trough at Ambleside. 
P. minutum (Ealfs) Cleve. W., Hk. 
P. sp. Long. 27-30 p ; lat. 10 p,. Fig. 7. Pike of Bliscoe. 
Genus Gylindrocystis Menegh. 
G. Brebissonii Menegh. Yery frequent. Zygospores seen from 
Stickle Tarn. 
G. crassa De Bary. H., H., Sk., Kirk Fell. 
G. diplospora Lund. Sk., Hk. 
Genus Tetmemorus Ealfs. 
T. Brebissonii (Menegh.) Ealfs. 11 p., Sk., C., Buttermere, 
Scawfell. 
var. minor De Bary. Hk., Brandreth. 
T. granulatus (Breb.) Ealfs. Common, 
f. minor Nordst. Sk. 
var. attenuatus West. Sk., Bt., Hk. 
T. Isevis (Kiitz.) Ealfs. Common. 
Genus Spirotsenia Breb. 
S. condensata Breb. Bo., Hk. 
Genus Mesotsenium Nag. 
M. micrococcnm (Kiitz.) Kirchn. Sk. 
M. mirificum Arch. Sk. 
M. De Greyii Turn. Bn. 
