. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. FIGURE 9. Characteristic silicoflagellate complex of the Late Eocene of the Uzen'-Kairakty River, a tributary of the Irgiz River; 1—Distephanus speculum var. pentagonus Lemm.; 2, 3—D. crux (Ehr.) Hack. var. crux; 4 —Dictyocha fibula Ehr. var. fibula f. fibula; 5 —D. aff. fibula var. rhombus Schulz; 6 —D. triacantha var. a pi cu lata Lemm. f. apiculata; 7—D. t. var. flexuosa (Stradner) Gleser; 8-D. spinosa (Defl.) Gleser. 183 Analysis of original materials and published data shows that the Late Eocene silicoflagellate fl
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. FIGURE 9. Characteristic silicoflagellate complex of the Late Eocene of the Uzen'-Kairakty River, a tributary of the Irgiz River; 1—Distephanus speculum var. pentagonus Lemm.; 2, 3—D. crux (Ehr.) Hack. var. crux; 4 —Dictyocha fibula Ehr. var. fibula f. fibula; 5 —D. aff. fibula var. rhombus Schulz; 6 —D. triacantha var. a pi cu lata Lemm. f. apiculata; 7—D. t. var. flexuosa (Stradner) Gleser; 8-D. spinosa (Defl.) Gleser. 183 Analysis of original materials and published data shows that the Late Eocene silicoflagellate flora differs from one part of the globe to another. While species of Dictyocha Ehr. and Naviculopsis Freng. attain considerable density in the West Siberian plain and on the eastern slope of the Urals, the flora of the Turgai Gates is dominated by representatives of Dictyocha Ehr. and Distephanus Stohr, and Naviculopsis Freng. and Distephanus Stohr are the most typical forms of the Californian flora- Of species common in the Late Eocene to all regions, Naviculopsis biapiculata (Lemm.) Freng. must be noted. This species is known from Western Siberia and Kazakhstan, as well as from southern Sweden (Cleve-Euler and Hessland, 1948) and California (Hanna, 1931; Clark and Campbell, 1945; Mandra, 1960). As in Western Siberia, this species is represented in California by 2 varieties which occur in large numbers (Mandra, 1960). Varieties of Dictyocha triacantha Ehr. are also shared with the Californian flora. One form, D. deflandrei var. completa Gleser f. completa (D. staurodon Ehr. as deter- mined by Cleve-Euler, 1. c), has been encountered in Sweden and Western Siberia. 196. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Botanicheskii institut im. V. L. Komarova. Jerusalem [Published for the National S
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectplants
