File:Image from page 395 of "The structure and development of mosses and ferns (Archegoniatae)" (1918) (14785203105).jpg

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Identifier: structuredevelop00camp3 Title: The structure and development of mosses and ferns (Archegoniatae) Year: 1918 (1910s) Authors: Campbell, Douglas Houghton, 1859-1953 Subjects: Publisher: New York, Macmillan


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Text Appearing Before Image: h,while in one species, T. bracJiypits, as many as nine primaryxylem masses are found. The Marattiaceas alone, among theother Ferns, show such great variability. Trichomes occur, but not so abundantly as in most of theLeptosporangiatse. They have usually the form of hairs,which are either temporary (those formed on the margins ofthe young leaves) or persistent for a longer time, like thosethat cover the end of the stem apex and bases of the petioles inmany species. The Sporangkim All of the Hymenophyllaceas agree closely in the position ofthe sporangia, whose development has, however, been studiedin detail only in Trichomanes; but from the close correspond- 382 MOSSES AND FERNS CHAP. ence in other respects it is not likely that Hymenophyllum dif-fers essentially from the latter. The sorus occupies the freeend of a vein, which often continues to grow for a long timein Trichomanes, and forms a long slender placenta or colum-ella, upon which the sporangia arise basipetally. While the sp.

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Source Image from page 395 of "The structure and development of mosses and ferns (Archegoniatae)" (1918)
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