. Plant life, considered with special references to form and function. Plant physiology. Fig. 39. Fig. Fig. 41. Fig. 39.—An entire plant of Polysiphonia^ showing mode of branching. Natural size.—After Kiitzing. {See tig. 229.) Fig. 40.—Transverse section of one of the branches of Pc^lysi/'honia^ showing a minute central cell with four large and four small cells surrounding it. Magnihed about 50 diam.—From a drawing by Mr. Grant Smitll. Fig. 41. — of a branch of Polysiphonia which has nearly ceased growing. Magnified about 100 diam.—From a drawing by Miss Rowan. this Structure a]5pears ;
. Plant life, considered with special references to form and function. Plant physiology. Fig. 39. Fig. Fig. 41. Fig. 39.—An entire plant of Polysiphonia^ showing mode of branching. Natural size.—After Kiitzing. {See tig. 229.) Fig. 40.—Transverse section of one of the branches of Pc^lysi/'honia^ showing a minute central cell with four large and four small cells surrounding it. Magnihed about 50 diam.—From a drawing by Mr. Grant Smitll. Fig. 41. — of a branch of Polysiphonia which has nearly ceased growing. Magnified about 100 diam.—From a drawing by Miss Rowan. this Structure a]5pears ; at the tips even of the main axis the body is a linear aggregate (fig. 41). Polysiphonia, there- fore, may be looked upon as one of the simplest forms of a solid aggregate. 39. Apical cell.—As in Chara, growth in length is quite definitely localizetl, because it is the elongated terminal cell of either the main or secondary axes (fig. 41) which pro- duces, by division near its base, the new cells whose subse- quent enlargement and division give rise to the axis. In some red alga; the chamljers arc not cells but ccenocytes, as shown by the several nuclei. 40. Color.—In this plant, as in very many of the marine. 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectplantphysiology
