. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. (20?;. FIGURE 16. Phylogenetic links between the families Cornuaceae Gem. and Dictyochaceae Lemm.: 1—Lyramula simplex Hanna; 2—L. furcula Hanna; 3—Lyra- mula sp.; 4, 5—Cornua poretzkajae Gleser; 6 —Dictyocha triacantha var. inermis Lemm. f. inermis. Dictyocha Ehr. occurs very rarely (isolated specimens) in the Santonian-Campanian of the eastern slope of the Urals. It is represented there mainly by different forms of a single species — Dictyocha tria- cantha Ehr.; the simplest of these is D. triacantha var. inermis Lemm.
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. (20?;. FIGURE 16. Phylogenetic links between the families Cornuaceae Gem. and Dictyochaceae Lemm.: 1—Lyramula simplex Hanna; 2—L. furcula Hanna; 3—Lyra- mula sp.; 4, 5—Cornua poretzkajae Gleser; 6 —Dictyocha triacantha var. inermis Lemm. f. inermis. Dictyocha Ehr. occurs very rarely (isolated specimens) in the Santonian-Campanian of the eastern slope of the Urals. It is represented there mainly by different forms of a single species — Dictyocha tria- cantha Ehr.; the simplest of these is D. triacantha var. inermis Lemm. f. inermis. Close relations of this form, D. triacantha var. apiculata Lemm. f. apiculata and f. late-radiata, are already equipped with radial horns, though very short ones; D, tria- cantha var. apiculata f. late-radiata Schulz has features in common with Corbisema geometrica Hanna, which is not known in the Santonian-Campanian of the eastern slope of the Urals but occurs in large amounts in the Maestrichtian of California. A variety of silico- flagellates of the family Dictyochaceae have been described from the Upper Cretaceous deposits of the Gulf of Danzig. However, the lack of quantitative data makes it difficult to use these materials for an analysis of the development of the silicoflagellate flora. 223. 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 Science Foundation, Washington, D. C. by the Israel Program for Scientific Translations
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectplants
