. A handbook of cryptogamic botany. Cryptogams. 32 VASCULAR CRYPTOGAMS the lower and larger portion of the protoplasmic cell-contents contract- ing into an oosphere. If the archegone remains unfertilised the prothal- lium continues to grow into a comparatively large chlorophyllous structure with rhizoids. The male prothallium and antherids are reduced to a still more. Fig. 14.—Marsilea sahatrix L. Longi- tudinal section through megaspore, pro- thallium, and embryo. a;«, starch grains; r, inner ccat ; ex^ epispore; c, space heneath diaphragm ; pt.^ prothal- lium ; -wkj its rhizoids; a, archegon
. A handbook of cryptogamic botany. Cryptogams. 32 VASCULAR CRYPTOGAMS the lower and larger portion of the protoplasmic cell-contents contract- ing into an oosphere. If the archegone remains unfertilised the prothal- lium continues to grow into a comparatively large chlorophyllous structure with rhizoids. The male prothallium and antherids are reduced to a still more. Fig. 14.—Marsilea sahatrix L. Longi- tudinal section through megaspore, pro- thallium, and embryo. a;«, starch grains; r, inner ccat ; ex^ epispore; c, space heneath diaphragm ; pt.^ prothal- lium ; -wkj its rhizoids; a, archegone; _X foot; w, root of embryo ; A, coty- ledon ; j/, mucilaginous envelope of megaspore. (After Goebel, x 60.) Fig. 15.—Marsilea salaatrix. A^ prothallium ft, projecting from ruptured coat r of mega- spore ; j/, layers of mucilage forming funnel, with antherozoids. B^ vertical section of prothallium pt; 0, oosphere; a, stigmatic cells. (After Goebel, greatly magnified.) rudimentary conditioti than in the Salviniaceae. The contents of the microspore divide into three cells, one of which (the prothallium) remains sterile, the other two constituting the antherid. The contents of each of these two cells again divide into sixteen antherozoid-mother- cells. From the nucleus of each of these is formed an antherozoid;. 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 Bennett, Alfred W. (Alfred William), 1833-1902; Murray, George Robert Milne, 1858-. London, New York, Longmans, Green, and Co.
Size: 1569px × 1592px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondonnewyorklongm
