. The structure and development of mosses and ferns (Archegoniatae). FiG. 95.—A, B, Germinating spores of A. petrophila, X200; C, protonema with bud(fe); D, young archegonium in optical section; E, i, 2, two views of a very youngembryo of A. crassinerva, X266; F, somewhat older embryo of A. petrophila; G,older embryo showing the first archesporial cells; H, I, cross-sections of youngembryos, X200. A-D, after Kuhn; E-I, after Waldner. rhizoids. The flat protonema recalls strongly that of Sphag-num, and is probably genetically connected with it. All of thedifferent protonemal forms, except what
. The structure and development of mosses and ferns (Archegoniatae). FiG. 95.—A, B, Germinating spores of A. petrophila, X200; C, protonema with bud(fe); D, young archegonium in optical section; E, i, 2, two views of a very youngembryo of A. crassinerva, X266; F, somewhat older embryo of A. petrophila; G,older embryo showing the first archesporial cells; H, I, cross-sections of youngembryos, X200. A-D, after Kuhn; E-I, after Waldner. rhizoids. The flat protonema recalls strongly that of Sphag-num, and is probably genetically connected with it. All of thedifferent protonemal forms, except what Kiihn calls the leaf-like structures, vertical cell surfaces of definite form, can giverise to the leafy axes. The development of these seems to cor-respond exactly with that of the other Mosses, and will not befurther considered here. i84 MOSSES AND FERNS chap. The Sexual Organs The species of Andrecea may be either moncecious or dioe-cious. Archegonia and antheridia occur on separate branches,but their origin and arrangement are identical. The first-formed ant
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