Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 480
eticulations. When placed upon a damp surface, and exposed PEOTHALLIUM OF FERNS. 41 JLO to a sufficiency of light and warmth, the spore^ begins to • germi-nate; the first indication of its vegetative activity being a slightenlargement, which is manifested in the rounding-off of its angles.This is… … Development of Prothallium of Pteris serrulata:—A, Sporeset free from the theca;—B, Spore beginning to germinate,putting forth the tubular prolongation a, from the principalcell b;—C, first-formed linear series of cells ;—D, Prothalliumtaking the form of a leaf-like expansion; a, first, and 6,…
Microscopy · Biology
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