248 
E. FJERDINGS'JAD 
Amphora evalis Kütz., Cocconeis placeniiila Elirbg., Cymbella 
microcephala Gruii.. Denticiila tenuis Kütz., Epiihemia argus Kütz., 
E. var. alpestris Grun., E. tiirgida (Ehrbg.) Kütz., Nitzschia angu~ 
slata (\\'. Smith) Grun.. Pinniilaria gracillima Gregory, Rhopalodia 
parallela (Grun.) O. Müll., and in addition a number of indéter¬ 
minable diatom fragments. 
LITERATURE 
Fristch F. E., 1929. — The incrusting algal connnunitics of certain 
fasMlowing streams. Neiv Phytologist, 28, p. 165-96. 
— 1949. — The limc-cncrusted Phormidium community of British 
streams. Verh. liüern. Ver. Limnol., 10. 
— & Pantin C. F. A. — Calcareous concrétions in a Cambridge- 
shire strcam. Nature, 157. 
Kann Edith, 1941. — Cyanophj-ceenkrusten aus einen Teich bei Abisko 
(Schwedisch Lappland). Arch. f. HydrobioL, 37, p. 495-503. 
— — 1943. — Krustenalgcn in A’penbachen. Ibid., 40, p. 459-473. 
— — 1941. — Krustcn.steine in Seen, ibid., 37, p. 504-32. 
Jaag O., 1938. — Die Kryptogamenflora aus Rhcinfalls und des Hochr- 
heins von Stein bis î:glisau. Milt. Nolurf. Gesell. Schoffhoiisen, 14. 
PiA 1934. — Die Kalkbildung durch Pflanzen. Beihefl z Bot Cen- 
tralbl., 52. 
Rhoddy h. J., 1915. — Concrétions in streams formed by the agency of 
bluegreen algae and relatcd plants. Proc. Phil. Soc. Philadelphia, 54. 
