. Botany for high schools and colleges. Botany. 366 BOTANY. into four cells {C, Y\g. 250), and from these the young plant of the asexual generation is developed. The young plant is quite simple, having small internodes, bearing sheaths which contain but three leaves ; lar- ger shoots soon arise, with lar- ger internodes and sheaths hav- ing more leaves, and these are followed by others still large)-, until at last the full size is reached. 479. — Tlie spores of the Equisetinse are produced either upon the ordinary green stems, as in Equisetum limosiim and E. hyemale, or upon colorless or brown
. Botany for high schools and colleges. Botany. 366 BOTANY. into four cells {C, Y\g. 250), and from these the young plant of the asexual generation is developed. The young plant is quite simple, having small internodes, bearing sheaths which contain but three leaves ; lar- ger shoots soon arise, with lar- ger internodes and sheaths hav- ing more leaves, and these are followed by others still large)-, until at last the full size is reached. 479. — Tlie spores of the Equisetinse are produced either upon the ordinary green stems, as in Equisetum limosiim and E. hyemale, or upon colorless or brownish stems, which de- velop early, and, after bearing the spores, die and disappear, as in E. Telmateia and E. arvense. The sporangia are developed upon modified leaves, upon the ends of the stems. The spore - bearing leaves, like the ordinary ones, are in whorls; each leaf is, however, peltate in form, and borne upon a short stalk (s^, Fig. 251, B). These peltate leaves (usually called the pel- Fig. 2bl.—Equisetum Telmateia. A, x - opqlpo\ o^p pollppfprl infn upper part of a fertile stem, with lower ^^^^ SOaies; are COlieCcea lUtO Sfrd^eSSi':;:j;Lfr^^';.in|trm! cone-shaped clusters, and by L'etiiS'S^tttrSwSiafe W^eir nintnal pressure each been cut off ; tj, section of the rachis of scalc bcCOmeS morC Or leSS the spike. B, peltate scales, 5,5, in . various positions (slightly magnified); llCXagOnal in OUtlmC. Upon sporangia borne on the under side ,, -, „ <? i i of the scales ; st, st, the pedicels of the the Unclcr SUriaCC 01 eacll SCaiO scales.—After Sachs. , i • ix ^ • x there arise nve to nine or ten cellular masses, which enlarge and become sac-shaped spo- rangia ; certain inner cells become spore mother-cells, and from each of these four spherical spores are produced. The. 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
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