. The structure and development of mosses and ferns (Archegoniatae). Fig. 91.—A, Male catkin of Sphagnum cymhifoUum, X50; B, young antheridium ofS. acutifolium, X350; C, opened antheridium of the same species; D, spermatozoid,Xiooo (about); E, female branch with sporogonium of S. acutifolium, slightlymagnified; cal, calyptra. A, C, E, after Schimper; B, after Leitgeb. the body of the antheridium. The first divisions in the bodyof the antheridium only take place after the stalk has become 176 MOSSES AND FERNS chap. many times longer than the terminal cell, and is divided intomany cells. The acc
. The structure and development of mosses and ferns (Archegoniatae). Fig. 91.—A, Male catkin of Sphagnum cymhifoUum, X50; B, young antheridium ofS. acutifolium, X350; C, opened antheridium of the same species; D, spermatozoid,Xiooo (about); E, female branch with sporogonium of S. acutifolium, slightlymagnified; cal, calyptra. A, C, E, after Schimper; B, after Leitgeb. the body of the antheridium. The first divisions in the bodyof the antheridium only take place after the stalk has become 176 MOSSES AND FERNS chap. many times longer than the terminal cell, and is divided intomany cells. The account of the development of the antheridium givenby Hofmeister and Schimper is incomplete, and differs in somerespects from that of Leitgeb. Neither of the former observ-ers seems to have clearly recognised the presence of a definiteapical cell from the first. Schimper ((i), p. 45), states thatafter the stalk has been formed four rows of segments arisefrom the terminal cell; to judge from the somewhat vaguestatements of Hofmeister ((i), p. 154), it appears that h
Size: 1033px × 2420px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
