Plants usually furnished with roots, leaves, and stems; in all cases containing well - developed vascular tissue. Reproductive organs composed of sporangia or spore - cases, containing microscopic spores, which on germination develop a prothallium.
XCIII. |
Filices. Sporangia minute, placed on the margin or under-surface of the leaf or frond, rarely somewhat larger and arranged in spikes or panicles. Spores all of one kind.—Fronds circinate in vernation (except in the suborder
Ophioglossaceæ). (p. 925.) |
XCIV. |
Marsileaceæ. Sporangia of 2 kinds, macrosporangia and microsporangia, enclosed together in the cavities or cells of globose sporocarps near the base of the fronds. Macrosporangia containing a single macrospore; microsporangia with numerous rnicrospores.—Marsh plants, usually of small size; fronds circinate in vernation. (p. 1030.)
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XCV. |
Salviniaceæ. Sporangia of 2 kinds, macrosporangia and microsporangia, enclosed in distinct sporocarps on the under-surface of the frond. Macrosporangia containing a single macro-spore; microsporangia with numerous microspores.—Free-floating fugacious annual water-plants, of small size. (p. 1030.) |
XCVI. |
Lycopodiaceæ. Sporangia all of one kind, placed singly at the upper base of the leaves or of the bracts of a spike or cone.—Stems simple or branched, erect or pendulous, or prostrate and creeping, usually leafy throughout; leaves small. (p. 1032.) |
XCVII. |
Isoetaceæ. Sporangia large, placed in a hollow of the dilated base of the leaf, those of the outer leaves containing macrospores, those of the inner leaves microspores.—Aquatic or amphibious stemless plants, often entirely submerged; leaves densely tufted, linear or filiform. (p. 1042.) |