. Foundations of Botany. Botany. TYPES OF CRYPTOGAMS; THALLOPIIYTES 251. Fig. 184. — Kockweed (Fucus). A, antheridia borne on branch- ing bairs, x 160; B, anthero- zoids from same, x 330. can be detected. After making the microscopic examination which follows, note what correspondence of structure with color has been observed. Cut very thin sections through fruiting tips from different plants, keeping those from each plant separate. Be sure that some of the cuts pass through the conceptacle as near the middle as possible. Examine with a power of about sixty diameters sections from different fr
. Foundations of Botany. Botany. TYPES OF CRYPTOGAMS; THALLOPIIYTES 251. Fig. 184. — Kockweed (Fucus). A, antheridia borne on branch- ing bairs, x 160; B, anthero- zoids from same, x 330. can be detected. After making the microscopic examination which follows, note what correspondence of structure with color has been observed. Cut very thin sections through fruiting tips from different plants, keeping those from each plant separate. Be sure that some of the cuts pass through the conceptacle as near the middle as possible. Examine with a power of about sixty diameters sections from different fronds, searching for one kind containing rather large egg-shaped cells and another con- taining bundles of numerous smaller sac-shaped cells. With a power of 200 diameters study the details of the sec- tions. Xote the character of the cells forming the surface of the frond, those of the inner structure, and those limit- ing the cavity of the conceptacle. In a conceptacle cut through the middle note the form of the orifice. Examine the slender hairs or filaments (paraphyses) which, arising at right angles, line the walls of the conceptacle. 294. Obgonia and Antheridia. — In conceptacles containing egg-shaped cel]s (oogonia) note the form, mode of attachment (ses- sile or stalked), and dif- ferent stages of develop- ment. At maturity the contents are divided, forming eight oospheres; but not all can be seen —Bockweed (.Ptoctw). at once some beillf be- ^>0^Sonium>itscontents dividing into eight oospberes, . ' x 160: ]',. an oiispbere, escaped, surrounded by an- neath the others. tberozoids, x 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn & company
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