. The essentials of botany. Botany. CONFERVAS 173 snow plant" of high mountains and polar regions, a unicellular ciliated organism (Chlamydomonas) which is usually of a red color, and some more common but similar, often red, organisms (Haematococcus) found in pools and on wet earth. They are all more like animals than plants. Class 4. CONFERVOIDEAE. Confervas 241. The Confervas are simple or branched filaments of cells, or a sheet (plate) of cells, and number about 640 species. They propagate by (1) the fracture of the filaments (into hormogones), (2) ciliated zoospores, (3) thick-walled
. The essentials of botany. Botany. CONFERVAS 173 snow plant" of high mountains and polar regions, a unicellular ciliated organism (Chlamydomonas) which is usually of a red color, and some more common but similar, often red, organisms (Haematococcus) found in pools and on wet earth. They are all more like animals than plants. Class 4. CONFERVOIDEAE. Confervas 241. The Confervas are simple or branched filaments of cells, or a sheet (plate) of cells, and number about 640 species. They propagate by (1) the fracture of the filaments (into hormogones), (2) ciliated zoospores, (3) thick-walled spores (chlamydospores), and generate by the union of isogametes or heterogametes, to form a zygote which often becomes a thick-walled spore. They are mostly fresh-water plants, in ponds and in running waters. 242. The simplest of the Confervas are small unbranched filaments (spe- cies of Ulothrix) which are usually attached by a basal cell ("root"). They propagate by 2- or 4-ciliated zoospores, and generate by the union of 2-ciliate gametes. 243. The very similar, much-branched and rooted Draparnaldia and Chaetophora present a slightly higher development of the same type. They are common in running fresh water. 244. Related to these are the Sea-Lettuces common on stones, wharf-timbers, etc., along the coast and in brack- ish waters, and resembling small lettuce leaves. Each plant consists of a single layer of cells (Monostroma) or two layers (Ulva), and nearly every cell is capable of. Fig. 67.—Ulothrix 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 Bessey, Charles E. (Charles Edwin), 1845-1915; Bessey, Ernst Athearn, 1877-1957. joint author. New York, H. Holt and company
Size: 1705px × 1466px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
