. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. HepaticsB. 523, Marchantia, sterile plant. 524—5, Fertile plant. 526, Vertical section of the fertil-receptaclc ; 527, of a perianth, showing the sporange bursting. 52S, One of tho elator* with four spores. 529, Portion of it highly magnified. of the flowering plants. In the mosses, liver- worts, etc., they appear only on the full-grown plant; in the ferns, Equisetacese, etc., they ap- pear only on the prothallus, the earliest
. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. HepaticsB. 523, Marchantia, sterile plant. 524—5, Fertile plant. 526, Vertical section of the fertil-receptaclc ; 527, of a perianth, showing the sporange bursting. 52S, One of tho elator* with four spores. 529, Portion of it highly magnified. of the flowering plants. In the mosses, liver- worts, etc., they appear only on the full-grown plant; in the ferns, Equisetacese, etc., they ap- pear only on the prothallus, the earliest growth of the spore, and here the archegone gives hirth to an embryo, whence at length the true fern arises, while the prothallus dies away. 630. Spores. These are the true reproductive germinating bodies of the Cryptogams. They con- sist each of a single cell, often exceedingly minute, and produced in immense numbers. The cell wall of the spore may be sim- ple (Botrytis) or double, as if a cell within a cell (ferns). But the spores „ ro_ . x ' " Fungi. 587, Agancus (Mushroom) in various stazes: a, are often apparently tearing open the volva; 6, annulus. the remains of tho veil double or 2-celled fljch_ («): r'Pilous; ;'cclium- 688> Portion of the gill* 63», . ^ Bnsldla anil spores from the same (majn. 400 riiam). 540, ens), Or 4-Celled, or 6, 8, Oyathus; 541, Section. 542, One of tho conceptacles. MS, or many-celled. These r>t"ic'lil,tn (mildew). 544, Mucor; a, mycelium. compound spores are in fart spore-vessels inclosing several spores yet immature, and called sporidia or theca-spores. The spores or sporidia are often inclosed in still larger cells called the sac. 631. Endo3pores and exospores. Spores are developed either in the interior of the parent cell or on the outside of it, and hence the di- 540. 537. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectbotany, bookyear1861
