. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Table II, Figures 6, 7; Lemmermann (1903), Nord. Plankton 2, 2, p. 29, Figure 98; Lemmermann (1908), Nord. Plankton 21, 8, p. 29, Figure 98; Martin (1904), Maryland Geol. Surv. Mioc. 2, p. 448, Plate 130, Figures 1 — 2; Gaponov (1914), Zap. Novoross. obshch. estestvoispyt. 39, p. 335, Figure 33; Gaponov (1915), Ezhegodn. po geol. i mineral. Rossii, 17, 1-3, p. 40, Table 3, Figure 28; Schulz (1928), Bot. Arch. 21, 2, p. 255, Figure 44; Hanna (1928), Bull. Amer. Assoc. Petrol. Geol. 12, 10, Plate 9, Figure 5; Gemeinhardt
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Table II, Figures 6, 7; Lemmermann (1903), Nord. Plankton 2, 2, p. 29, Figure 98; Lemmermann (1908), Nord. Plankton 21, 8, p. 29, Figure 98; Martin (1904), Maryland Geol. Surv. Mioc. 2, p. 448, Plate 130, Figures 1 — 2; Gaponov (1914), Zap. Novoross. obshch. estestvoispyt. 39, p. 335, Figure 33; Gaponov (1915), Ezhegodn. po geol. i mineral. Rossii, 17, 1-3, p. 40, Table 3, Figure 28; Schulz (1928), Bot. Arch. 21, 2, p. 255, Figure 44; Hanna (1928), Bull. Amer. Assoc. Petrol. Geol. 12, 10, Plate 9, Figure 5; Gemeinhardt (1930), Silicofl. In: Rabenhorst's 10, 2, p. 58, Figure 49; Deflandre (1932), Bull. Soc. bot. Fr., 79, p. 459, Figure 2; p. 502, Figures 36, 38; Deflandre (1932), Bull. Soc. fr. Microsc. 1, 1, p. 19, Figures 41—43; Zhuze (1955), Bot. mater. Otd. spor. rast. BIN AN SSSR, 10, p. 80, Figure 10; Desikachary and Macheshwari (1956), Bot. Soc. 35, 3, p. 260, Text-figure 14, Table 13, Figure 7. - Dlstephanus crux var. apiculatus Lemmermann (1901), Ber. Dtsch. bot. Ges. 19, 1, p. 262. - D. crux f. aspera Schulz (1928), Bot. Arch. 21, 2, p. 257, Figure 45. — D. crux f. longispina Schulz, Ibid., p. 256, Figure 44 (?). — D. crux f. brevispina Schulz, Ibid., p. 256 (?). — Dictyocha crux Ehrenberg (1840), Ber. Verhandl. Konig. Akad. Wiss. , p. 207; Ehrenberg (1854), Mikrogeol., Table 18, Figure 56, Table 20, Figure 46a-c. Table 33, gr. 15, Figure 9; Tynan (1957), Micropaleont. 3, 2, p. 131, Table 1, Figures 2-8; Proshkina- Lavrenko (1959), Tr. BIN AN SSSR, Seriya 2, Spor. rast. 12, p. 152, Table 1, Figures 10 — 12. — D. fibula f. speculum Frenguelli (1935), Ann. Mus. Argentino Ciens. Nat. 38, Table 5, Figures 2 — FIGURE 24. Distribution of Distephanus crux (Ehr.) Hack. var. cru x in seas of the USSR Basal ring is quadrangular, 17 —35 )U in diameter, with straight or slightly convex sides, 11 — 29 /lx long. Radial horns are either more or less uniform,
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