. Foundations of botany. Botany; Botany. TYPES OF CRYPTOGAMS; THAXLOPHYTES 249 the suiface of the enveloping cells \fhich enclose the spore. What is their number and form ? What is their relation to the cells form- ing the crown? Focus so as to see the large egg-cell (oosphere or oospore) which constitutes the center of the fruit. Can you determine anything regarding its contents ? Search for young oogonia and if practicable describe and draw them in several stages of development. Their structure can be seen much more easily than that of the antheridia. Make drawings to illus- trate various de
. Foundations of botany. Botany; Botany. TYPES OF CRYPTOGAMS; THAXLOPHYTES 249 the suiface of the enveloping cells \fhich enclose the spore. What is their number and form ? What is their relation to the cells form- ing the crown? Focus so as to see the large egg-cell (oosphere or oospore) which constitutes the center of the fruit. Can you determine anything regarding its contents ? Search for young oogonia and if practicable describe and draw them in several stages of development. Their structure can be seen much more easily than that of the antheridia. Make drawings to illus- trate various details of structm-e. 290. Characeae. — Nitella and Chara are the genera composing the group Oharor cece, a group of green algge differing widely from any others. They show in a won- derful manner simplicity of cell-structure with a high degree of organization. Scarcely less wonderful are the care and precision with which botanists have worked out their life history. As a study in evolution the CTiaraoece may be considered as representing the highest develop- ment attained along the line of filamentous green algae, which, while preserving their algal characteristics, are comparable in a remarkable degree with moss- and fern- plants and with seed-plants. Every cell in the plant has been accounted for and is understood in regard to origin, relationship, and function. With harmony of structure throughout, it has organs comparable to root, stem, and leaf in seed-plants, each with characteristic structure and. Fig. 182. —Part of a Leaf of Fig. 181. (Considerably magnified.) a^antiieridium; o,oc>gonium. At the right are a young antheridium and 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; Eastwood, Alice, 1859-1953. Boston, Ginn & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
