. Maryland geological survey. GlatJiraria Schimper 1872, Yatesia Carruthers 1870, Fittonia , Platylepis Sap. 1875, Buclclandia Presl 1825, Mantellia Brongn, 1828,Tysonia Font. 1889, Bolbopodium Sap. 1875, Cylindropodium Sap. 1875, Pala-tylepis Sap. 1875, Clathropodium Sap. 1875, Gycadeomyelon Sap. 1875, Rau-meria Carr. 1870, WilUamsonia Carr. 1870, Crossosamia Carr. 1870, etc., manyof course being synonyms. 314 Systematic Paleontology trunks. An alternative course largely followed abroad would be toconsider them referable to the genus Bennettites of Carruthers. This isthe view advocat
. Maryland geological survey. GlatJiraria Schimper 1872, Yatesia Carruthers 1870, Fittonia , Platylepis Sap. 1875, Buclclandia Presl 1825, Mantellia Brongn, 1828,Tysonia Font. 1889, Bolbopodium Sap. 1875, Cylindropodium Sap. 1875, Pala-tylepis Sap. 1875, Clathropodium Sap. 1875, Gycadeomyelon Sap. 1875, Rau-meria Carr. 1870, WilUamsonia Carr. 1870, Crossosamia Carr. 1870, etc., manyof course being synonyms. 314 Systematic Paleontology trunks. An alternative course largely followed abroad would be toconsider them referable to the genus Bennettites of Carruthers. This isthe view advocated by Seward and adopted by Potonie in Engler andPrantls Naturlichen Pflanzenfamilien. Solms-Laubach has already referred many of the species of Bennett-ites to Cycadeoidea restricting the former name to specimens showinglateral axillary fructifications. Seward^ would use Cycadeoidea in asomewhat different sense, for all cycadean trunks, whether short andthick or tall and slender, which are covered with persistent Fig. 5.—Transverse section of a partly emergent but still folded frond ofCycadeoidea ingens deeply embedded in ramentum, X 4 (after Wieland). and which show no trace of lateral reproductive shoots such as character-ize Bennettites gihsonianus Carruthers and allied forms, and which thereis no reason for including in the family Cycadacese. It has been shownby Wieland* that fruition was the culminant event in the life of most,if not all, the trunks which he investigated, fruits not being produced ? Seward, Jurassic Flora, 1904, pt. ii, p. 44. Capellini and Solms-Laubach, 1891, Mem. R. Accad. Sci. Inst. Bologna (5),vol. ii, p. 161. Seward, loc , American Fossil Cycads, 1906. Maryland Geological Survey 315 until vegetative maturity. It would follow, if the method just men-tioned were pursued, that a BennetUtes which was not mature enoughto show indications of flowering would be a Cycadeoidea, or an accidentof preservation might equally determine
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