. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. THE MALE GAMETOPHYTE 125 microspores lying side by side, and measuring 3 by 2,000 M when mature. That this is a tetrad is evident from the rapid succession of the divisions, the reduction of chromosomes, and the formation of four spores from a mother-cell. In some cases a mother-cell may give rise to less than four microspores, or may produce more than the normal number (Fig. 60). In 1886 Wille15 summarized the work of previous investigators, notably of Hofmeister, Tangl, Wimmel, and Tschistiako
. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. THE MALE GAMETOPHYTE 125 microspores lying side by side, and measuring 3 by 2,000 M when mature. That this is a tetrad is evident from the rapid succession of the divisions, the reduction of chromosomes, and the formation of four spores from a mother-cell. In some cases a mother-cell may give rise to less than four microspores, or may produce more than the normal number (Fig. 60). In 1886 Wille15 summarized the work of previous investigators, notably of Hofmeister, Tangl, Wimmel, and Tschistiakoff, and added the results of his own investigations. The following lists are made up largely of forms investi- gated by Wille himself: Two microspores from a mother-cell are occasion- ally found in Couvallaria -multiflora, Asparagus offi- cinalis, Aconitum Napellus, Euphorbia Lathyrus, Be- gonia sp., Saxifraga caespi- tosa, Azalea indica, and Syringa vulgaris. Three microspores were found in Begonia sp., Saxi- fraga caespilosa, Azalea in- dica, and Lonicera coerulea. Five microspores were found in Funkia ovata, Fi- caria ranunculoides, Stel- laria glauca, Sclerantlius ¥lo. 56,_Scr0phvlaria nodosa. Section of mi-. crosporangiurn showing appearance of spores formed by the simultaneous method; the inner tapetum of microsporangium consists of greatly elongated cells which are very glandular in appearance, x 275. annum, Prunus Cerasus, Rumex Patientia, Azalea indica, Lonicera coerulea, Syringa persica, and Sym- phytum officinale. Six microspores were found in Ilemerocallis fulva, Ficaria ranunculoides, Elatine hexandra, Cornus sanguinea, Lonicera coerulea, and Fuchsia sp. Seven microspores were counted with certainty in Fuchsia sp. and fourteen are reported rather doubtfully; eight is given for Azalea indica, and eight to twelve for Lonicera coerulea,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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Keywords: ., bookauthorcoulterj, bookcentury1900, bookdecade1900, bookyear1903
