SPIBOTJENIA. 39 



Nova Zembla. Spitzbergen. Japan. United States. 

 Cuba. 



This is the largest and most frequent of the British species 

 of Spirotsenia. It occurs frequently in bogs, especially in 

 mountainous districts, and is a very striking Desinid. The 

 cells may be quite straight or slightly but variously curved. 



2. Spirotsenia closteridia (Breb.) Arcb. 

 (PI. II, fig. 19.) 



Endospira closteridia Breb. in Kiitz. Tab. Phycolog. 1847, 1, p. 24, t. 36, f. 2. 



Palmoylosa closteridia Kiitz. Spec. Alg. 1849, p. 228. 



Spirotsenia closteridia (Breb.) Arch, in Proc. Dubl. Nat. Hist. Soc. 1864, 



p. 16 ; Rabenh. Flor. Europ. Alg. Ill, 1868, p. 146, fig. xylogr. p. 104 ; 



Roy & Biss. Scott. Desm. 1894; Nordst, Index Desmid. 1896, p. 75; 



Liitkem. Uatt. Spirotten. II, 1903, p. 12 (sep.), t. 11, f. 12, 13. 



Cells minute, 4-G^ times longer than their diameter, 

 fusiform, usually distinctly curved, apices obtuse ; 

 chloroplast parietal, with two revolutions. Cells often 

 gregarious in a mucilaginous jelly. 



Zygospore unknown. 



Length 14-28 /n ; breadth 3*3-5 //. 



SCOTLAND. Muchalls, Kincardine (Boy fy Bixwft). 



Gecxjr. Distribution. - - France. Germany (var.). 

 Bohemia (var.). 



3. Spirotaenia endospira (Kiitz.) Arch. 

 (PI. II, figs. 20-23.) 



Palmoglcea endospira Kiitz. Tab. Phycolog. I, 1847, p. 19, t. 24, f. 6. 

 Endospira Bryophila Breb. in Desrnaz. Crypt, de Fr. 1850, fasc. 40, no. 



1654. 

 Spirotsenia musicola De Bary, Conj. 1858, p. 75, t. 7 r ; Arch, in Pritch. 



Infus. 1861, p. 751. 

 Spirotsenia endospira (Kiitz.) Arch, in Proc. Dubl. Nat. Hist. Soc. 1864, 



p. 15 ; Liitkem. Gatt. Spirotam. II, 1903, p. 10 (sep.), t. 11, 1'. lo. 

 Spirotxnia Bryophila (Breb.) Rabenh. Flor. Europ. Alg. Ill, 1868, p. 146, 



fig. xylogr. p. 104; Wolle, Desni. U.S. 1884, p. 33, t. 3, f. 20; Cooke, 



Brit. Desm. 1886, p. 52, t. 19, f . 8 ; Nordst. Index Desmid. 1896, p. 70. 



Cells small, 2 or 3 times longer than their diameter, 

 oblong-cylindrical, straight or very slightly curved, 

 apices rounded ; chloroplast parietal, broad, with 

 1-1^ revolutions. Cells gregarious in a mucilaginous 



jelly- 



