. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. 322 MANUAL Oi? POISONOUS PLANTS Osmunda. h. Flowering Fern Tall ferns growing in swamps or low ground. Fertile fronds much con- tracted and bearing on the margins the short pedicelled, naked sporangia on the margins of their radii like divisions without chlorphyll; sporangia thin, reticulated, opening by a longitudinal cleft into two halves, with a few thick- ened cells the rudiment of the ring. There are six species in the North tem
. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. 322 MANUAL Oi? POISONOUS PLANTS Osmunda. h. Flowering Fern Tall ferns growing in swamps or low ground. Fertile fronds much con- tracted and bearing on the margins the short pedicelled, naked sporangia on the margins of their radii like divisions without chlorphyll; sporangia thin, reticulated, opening by a longitudinal cleft into two halves, with a few thick- ened cells the rudiment of the ring. There are six species in the North temperate regions, three species com- mon in the North, the Cinnamon Fern (O. cinnamomea), clothed with rusty wool; the Royal Fern (O. regalis), a smooth pale green fern, 2-S feet high, with 13-25 sterile pinnules; Clayton's Fern (O. Claytoniana), clothed with loose wool, but soon smooth; pinnae oblong lanceolate; some of the middle pinnae fertile. The O. regalis is used as a tonic and styptic. By some these ferns are regarded as injurious to stock. EQUISETALES. Horsetails Rush-like perennial plants, epidermis impregnated with silica; creeping root- stocks, stem generally hollow jointed, simple or branched, striated or grooved, provided with a double series of cavities and usually a large central one branches verticillate; leaves reduced to a sheath which is divided into teeth corresponding to the principal ridges of the stem; stomata in furrows;. »>,» ( D 4r,.^''°" °* Archegonia of Osmunda. A. Early development seen from J^A mL 5^' 7' J"^ J^?^. '" vertical section. C-B. Fartlier development. F. Opened â ,,;? ^ , â Neck in oblique section. /. Fertilization of the mature archegonium. ^^n^r^;'"?V n^^^ "/ ^^^ ^^'"^⢠"â '^â¢'"' <^e"' "â ess. be. spermatozoids, he. neck canal cells. B-J x 240. A. greatly magnified. After Please note that these images are extracted from scanned page images th
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