. Practical text-book of plant physiology. Plant physiology. GEMMAE 3" physes. The gemmae are two or three layers in thickness in the central region and one at the margin. Two to eight cells in the portions near the margin are seen to be thin-walled with the outer membranes convex, constituting the nematogones, or cells active in propagation. Although gemmae are produced through- out the year yet none may be found on the material collected. In this case allow the moss to grow for a few weeks in the moist chamber and examine again. When found detach a number, and. Fig. 145. Gemmae of vario
. Practical text-book of plant physiology. Plant physiology. GEMMAE 3" physes. The gemmae are two or three layers in thickness in the central region and one at the margin. Two to eight cells in the portions near the margin are seen to be thin-walled with the outer membranes convex, constituting the nematogones, or cells active in propagation. Although gemmae are produced through- out the year yet none may be found on the material collected. In this case allow the moss to grow for a few weeks in the moist chamber and examine again. When found detach a number, and. Fig. 145. Gemmae of various Muscineae. I, Marchantia polymorpha with cups containing gemma. 2, longitudinal section through cup of Marchantia. 3, gemma of Marchantia. 4, Tetraphis pellucida. 5, stem of Tetraphis bearing a cup con- taining gemmae. 6, longitudinal section of cup of Tetraphis showing gemmae. 7> 8, single gemmae of Tetraphis. 9, stem of Sciuroides with brood-bodies. 10, single brood-body of Leucodon. II, development of brood-body on rhizoids thrown out by a leaf of Campy lopus fragilis. 12, 13, 14, stages in the development of gemmae from apex of leaf of Syrrhopoden scaber. 15, Aulacomnion androgynum. 16, stalk of Aulacomnion bearing brood-bodies. 17, 18, single gemmae of Aulacomnion. After 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 MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1901
