. The essentials of botany. Botany. Fio. 113.—Spore-case clusters (spoie-dots, or sori) oE various Ferns. A, round and naked (Polypodium); B, round and covered (Aspidium); C, elongated and covered (Asplenlum); i>, elongated, and covei-ed by folding of the leaf (Adian- turn). All magnified. (The covering is known as the induslum.) Complicated fibro-vascular bundles run through the stems and extend into the leaves, where they branch extensively, forming the delicate veins which are so characteristic of fern-leaves. 426. The young leaves before expanding are coiled or rolled, so that as they g
. The essentials of botany. Botany. Fio. 113.—Spore-case clusters (spoie-dots, or sori) oE various Ferns. A, round and naked (Polypodium); B, round and covered (Aspidium); C, elongated and covered (Asplenlum); i>, elongated, and covei-ed by folding of the leaf (Adian- turn). All magnified. (The covering is known as the induslum.) Complicated fibro-vascular bundles run through the stems and extend into the leaves, where they branch extensively, forming the delicate veins which are so characteristic of fern-leaves. 426. The young leaves before expanding are coiled or rolled, so that as they grow up and open they unroll from below upwards (, circinately). Upon the lower surface of some of the leaves little clusters of club-shaped hairs (trichomes) grow out, generally in connection with a fibro- vascular bundle. The internal cells of the larger end of these hairs undergo subdivision, and thus give rise to a. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
