. Botany for high schools and colleges. Botany. 372 BOTANY. 490.—The Filicinse may be here arranged under four orders, as follows :* /. IsosporecB. — Spores of one kind. Order 1. Filices, the true Ferns. Sporangia compos- ed of modified tri- chomes, each de- veloped from a sin-. Fig. 256.—Prothallium and _ young plant antum Cajnllus-Veneris, seen section. ^9,2?, the prothallium hair ; E, the young plant; w, its first root leaf. X about 10.—After Sachs. Adi- m vertical longitudinal a, archegonia; h, root b, its first gle epidermal cell, produced in clusters on the surface of or- dinary or sligh
. Botany for high schools and colleges. Botany. 372 BOTANY. 490.—The Filicinse may be here arranged under four orders, as follows :* /. IsosporecB. — Spores of one kind. Order 1. Filices, the true Ferns. Sporangia compos- ed of modified tri- chomes, each de- veloped from a sin-. Fig. 256.—Prothallium and _ young plant antum Cajnllus-Veneris, seen section. ^9,2?, the prothallium hair ; E, the young plant; w, its first root leaf. X about 10.—After Sachs. Adi- m vertical longitudinal a, archegonia; h, root b, its first gle epidermal cell, produced in clusters on the surface of or- dinary or slightly modified leaves. Each sporangium with an elastic ring, l^o stip- ules. Order 2. Marattiacese, the Eingiess 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. Rhizoearpese, the Pepperworts. Sporangia com- posed of modified trich- omes (?); the microsporangia containing many microspores, * This arrangement is essentially that modification of Sachs' pro- posed by Professor McNab. See his " Outlines of the Classification of Plants," American edition, Chapter 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 Edwin, 1845- [from old catalog]. New York, H. Holt and company
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