286 .ions. KOYK PETKUSKN 



well as in vcry rold watcr. c. j>. by West (1911 p. 2H7, 289), in a lake 

 which ncver (|iiitc' thaws out. It has hccn foiiiui in sla{»nant and lim- 

 ning waler and al.so ou earlli (Ksmarcii 1911 p. ()<S . 



Lyngbya Rivularlarum (iom. 

 liomiml, Monoj;r. il |t. 1 18. 



S. ifcl. (ilji'iiiirli()lts:'i. iJrantii witli sli},'lil currcnt, tcnip. 15*^ '' s 1919. 

 Arca: luir., Air.. Aiislr.. Ha\vaii\ 



Oocurs in llie nuicilaj:!c uf varit)us aij^æ, viz. HivnhirUi, (..hwlophora 

 and Schizochlamys. In tlie Icclandic sample in a lliallus of Nosloc 

 carneiim. 



Lyngbya ochracea (iiolii) Tluir. 



N. W. Ict'l. DvrafjonVir Ilariol (1893 p. 315 , Helloc (1894 p. 6\ 

 Area: luir.. As., Air.. Am. 



I have not secn tliis species Irom Iceland. 



Lyngbya KLitzingii Sciimidle var. distincta (Nordst.) Lemm. 

 Lcmmermann 1910 ]). 136. 



E. Icel. Hallormstaci. streanilet in the wood, tenip. 20°. on Zyj^- 

 ncma and Ulotlirix ^^/e 1914. — N. I c cl. Sli'itnes in Myvatn, on Clado- 

 phora at the watcr's e(ige '-°/7 1914. — W. Icel. Geitabcr^svatn, stone 

 and moss near tlic marj^in. lemp. 12" ''.s 1914. — S. Icel. Reyl<javik, 

 Kil^istjorn. on (Uadophora -/s 1914. Varma near Heyl<jafos, on Clado- 

 pliora, tcmp. 18*^ ^^/s 1914. Holmsa, on Cladophora and Oedogoniiun, 

 temp. 14" ^*/8 1914. 



Area: Eur., Afr., Am., Austr., Lappland, Antarctic. 



Occurs as a rule epiphylic on larger algæ, cspecially on Clado- 

 /)honi, Oedogoniiun and Yancheria , in comi)any with species of C.ha- 

 mæsiplion. 



V. Symploca Kiilzing. 



Symploca Muscorum (Ag.) Gom. 



Gomont, Monogr. II p. 110, pi. II, fig. 9. 



Oscillatorid elcgans. Fl. dan. tab. 2517, 2 (non Agardh). 



W. Icel. Hclgavatn. At the side of a laug '"/s 1914. — S. Icel. 

 Revkjavik, Laugarnar, edge of hot basin (.aqueous vapour 10"?), vvater 

 88" (Stp.)! 



Area: Eur., As., Afr., Am. 



In both of Ihe two Icclandic samples a form was found which de- 

 vialcd to a certain exteiit from the typical S. mnsrorinn. On the sili- 

 ccous sinter at the side of the hot spring at Hclgavatn there grew crect, 

 separated, hardly centimcter-high fascicles. nearly black in colour, issuing 

 from a thin layer extended over the sinter. The trichomes were 4.5 — 

 6.1 // thick, the length of the cells e(|ualled the bieadlh or were some- 

 what longer. In the sample from Laugarne at Reykjavik a form occurred, 

 which at limes formed shorl (.1—2 mm.) erect fascicles, but as a rule 



