. 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 Alga (Diatoraa marinum) separating from each other.. Lichens, 530, CladAiia; the minute thallus at the ba.^6 of the podetia, cup-like above, bearing scarlet conceptacles. 531, Usnea. 532, Sticta. 533, Parmelia. 584, Receptacle,'vertical sec- tion. 535, A portion (highly magni&ed) with thecas aud paraphases. 636, A spore (double). numerous spores. In ferns they grow on the back of the frond
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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 Alga (Diatoraa marinum) separating from each other.. Lichens, 530, CladAiia; the minute thallus at the ba.^6 of the podetia, cup-like above, bearing scarlet conceptacles. 531, Usnea. 532, Sticta. 533, Parmelia. 584, Receptacle, 'vertical sec- tion. 535, A portion (highly magni&ed) with thecas aud paraphases. 636, 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 spbrmatozoids 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 Algfe, 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