. Botany for high schools and colleges. Botany. 372 Pig. 866.—Prothalllum and young plant of Adi- antum CapUlus-Veneris, seen in vertical longitudinal section. ^,^, the prothallium ; a, archegonia : h, root- hair ; E, the young plant; w, its first root; 6, its first leaf. X about 10.—After Sachs. 490.—The Pilicinse may be here arranged iiiider four orders, as follows :* /. IsosporecB.— Spores of one kind. Order 1. rilioes, the true Ferns. Sporangia compos- ed of modified tri- cViomes, each de- veloped from a sin- gle epidermal cell, prodnced in clusters on the surface of or- dinary or
. Botany for high schools and colleges. Botany. 372 Pig. 866.—Prothalllum and young plant of Adi- antum CapUlus-Veneris, seen in vertical longitudinal section. ^,^, the prothallium ; a, archegonia : h, root- hair ; E, the young plant; w, its first root; 6, its first leaf. X about 10.—After Sachs. 490.—The Pilicinse may be here arranged iiiider four orders, as follows :* /. IsosporecB.— Spores of one kind. Order 1. rilioes, the true Ferns. Sporangia compos- ed of modified tri- cViomes, each de- veloped from a sin- gle epidermal cell, prodnced in clusters on the surface of or- dinary or slightly modified leaves. Each sporangium with an elastic ring. No stip- ules. Order 2. Marattiaeese, the Eingless Ferns. Sporangia produced from a group of epi- dermal cells; the ring either rudimentary or wanting. The large, much-branched leaves with stipules. Order 3. Ophioglossacese, the Adder-Tongues. Sporan- gia formed by groups of cells in the interior of a modified branch of the sheathing leaf. The ring is absent. //. HeterosporecB. — Spores of two kinds. Order 4. Rhizocarpese, the Pepperworts. Sporangia com- posed of modified trich- omes (?); the microsporangia containing many Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1885
