. Botany for agricultural students . Botany. 432 PTERIDOPHYTES (FERN PLANTS) end is first produced, The development of this tube, called germ tube, is germination. The germ tube soon reaches its full length, and then it begins to broaden at the outer end and a tiny, green, heart-shaped gametophyte is produced {Fig. 384). The gametophyte resembles the thallus of the simplest Liverworts. When mature it has a cushion-like central axis where the rhizoids and sex organs are developed, and wing-like margins consisting of a single layer of cells. The game- tophyte is called a prothallus, the term ref
. Botany for agricultural students . Botany. 432 PTERIDOPHYTES (FERN PLANTS) end is first produced, The development of this tube, called germ tube, is germination. The germ tube soon reaches its full length, and then it begins to broaden at the outer end and a tiny, green, heart-shaped gametophyte is produced {Fig. 384). The gametophyte resembles the thallus of the simplest Liverworts. When mature it has a cushion-like central axis where the rhizoids and sex organs are developed, and wing-like margins consisting of a single layer of cells. The game- tophyte is called a prothallus, the term referring to the fact that it is thallus-hke in form and precedes the sporophyte in reproduction. In and around Fern beds in greenhouses Fern gametophytes are quite common on the Fig. 384.— Three Fern gametophytes shown about natural 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 Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
