VII.—Eurystoma trigona sp. nov., a Pteridosperm ovule borne on a frond of Alcicornopteris Kidston

J. G. Long
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引用次数: 15

Abstract

Synopsis Ovules of Eurystoma trigona sp. nov. are described. Over 330 unpollinated ovules were found attached to a petrified megasporophyll which appears to be a juvenile form of Alcicornopteris Kidston. Each ovule is triangular in cross section and has three wing-like extensions of the integument. None shows a female prothallus. The possibility that Alcicornopteris represents the fertile foliage of Stenomyelon is discussed.
描述了三角区Eurystoma trigona sp. 11 .的胚珠。超过330个未授粉的胚珠被发现附着在石化的大气叶上,这似乎是Alcicornopteris Kidston的幼体形式。每个胚珠在横截面上呈三角形,并有三个翅膀状的被皮延伸。没有一个显示雌性原体。讨论了Alcicornopteris代表Stenomyelon肥沃叶的可能性。
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