. 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. 551, Frustules of a, Diatomaceous Ah (Diatoma marinum) separating from eac other.. Lichens, 530, Cladonia; the minute thallus at the base of the podetia. cup-lilce 5bove, bearing scarlet conceptaclcs. 531, LTsnea. 532, Sticta. 533, Parmelia. 534, Ueceptacle, vertical sec- tion. 535, A portion (highly magnified) with thecffi and paraphases. 536, A spore (double). numerous spores. In ferns they grow on the back of the fronds i
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. 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. 551, Frustules of a, Diatomaceous Ah (Diatoma marinum) separating from eac other.. Lichens, 530, Cladonia; the minute thallus at the base of the podetia. cup-lilce 5bove, bearing scarlet conceptaclcs. 531, LTsnea. 532, Sticta. 533, Parmelia. 534, Ueceptacle, vertical sec- tion. 535, A portion (highly magnified) with thecffi and paraphases. 536, A spore (double). numerous spores. In ferns they grow on the back of the fronds in little clusters called sori. When mature, the sporange is torn open by the contraction of an elastic ring which surrounds it. In the mosses the sporange is stalked, solitary, terminal, and opens by a definite num- ber of teeth called the peristome. 633. Zoospores and spermatozoids are minute bodies endowed with spontaneous locomotion in water by means of vibratile ciliae. Zoospores of ovate form proceed from the vegetative cells of the Alg», swim about for a time, then settle down and grow into new plants. Sperma- tozoids are mostly filiform bodies with several ciliae, discharged from 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 perfectly resemble the original work.. Wood, Alphonso, 1810-1881. New York : A. S. Barnes & Burr