. The first [-fifth] reader of the school and family series. tility, meet us at eveiy step, and compel us to observe and leani,even when often the least disposed to inquiry or reflection.—Cuambers, 196 WILLSON S FIFTU HEADER. Part IV. THIRD DIVISIOK CRYPTOGAMOUS PLANTS. [€!ryp-tg-a-mous, or Flowevlcss Plants, are divided into two classes, Ac-ro-gens andTlial-lo-gens; the leading physiological peculiarities of which are, Ist. The stem of an Acrogens grows from the end, but does not increase in have breathing pores, or .stuviata^ in their skin or covering ; their leaves andstem
. The first [-fifth] reader of the school and family series. tility, meet us at eveiy step, and compel us to observe and leani,even when often the least disposed to inquiry or reflection.—Cuambers, 196 WILLSON S FIFTU HEADER. Part IV. THIRD DIVISIOK CRYPTOGAMOUS PLANTS. [€!ryp-tg-a-mous, or Flowevlcss Plants, are divided into two classes, Ac-ro-gens andTlial-lo-gens; the leading physiological peculiarities of which are, Ist. The stem of an Acrogens grows from the end, but does not increase in have breathing pores, or .stuviata^ in their skin or covering ; their leaves andstem are distinctly separated ; they produce no flowers, but multiply by reproductive sphe-roids or spore?, somewliat analogous to seeds, but whose nature is not well known. 2d. Thallojcns are mere masses of cells, they have no sUmiaia or breathing pores,foliage, or flowers ; and they multiply by the spontaneous formation in their interior, orupon their surface, of reproductive spheroids called spores.] LES. XXII. FERNS, LIVERWORTS, AND MOSSES. (aCROGENS.). 1. Polppodiwn rulgare.^ Common polypody, or Wall fern, xxi. 1, brown, 1 f, Striithw].ytei~is Pennsilvamca, Ostrich fern, xxi. 1, br.,2 f., Au. 3. Pteris atropur-picrea. Hock brake, xxi. 1, br., 10 in., 4. Ai>pidium Thebipteris, Lady fern, ,1 f, br., 5. Marchantia polymorpha. Variable liverwort, xxi. 6, dark green, 2in., moist rocks, winter. 6. Authoceros jninctata^ Dotted liverwort, xxi. 6, spring, darkgreen, 1J in., damp places. 7. S2^Jiagnum obtusifolium, Peat moss, xxi. 5, y. and g.,bogs, 7 in. 8. Oiminostomuni riridissimtnn, Green moss, xxi. 5, bright gieen, trees androcks, 1 in. 9. Griinmm apncarpa, Alpine moss, xxi. 5, dark olive, li in., tuftson rocks and trees. 10. Orthotrichwn crispum. Crisp moss, xxi. 5, bright green, 1 in.,trees. 11. G-rinimia pnhiimta, Cushion moss, xxi. 5, bright green, i in., Bartraviia HaVcriana^ Mountain moss, xxi. 5, bright green, 6 in., m
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