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Figure 4.29: The cell wall of the mature egg cell in Prumnopitys taxifoliaischaracterised by clusters of diversely shaped wall projections.A and B : Enlarged details of the two archegonia at central cell stage shown in Fig.4.20, viewed under phase contrast. (fg = female gametophyt€, V = vacuole, jc = jacketcells)A : ln a full-sized archegonium with immature cytoplasm (see Fig. 4.2O A) the centralcell wall (ccw) is noticeably thicker than the other cell walls. Scale bar = 50 pm.B : ln a central cellwith mature cytoplasm (see Fig. 4.20 D), the central cell wall (ccw)has become thicker than that in A. Scale bar = 50 pm.C, D and E : Details of the cell walls enclosing the mature egg cells shown in Fig. 4.28.C : Between the jacket cells fic) of two archegonia (A2, A3), a narrow strip ofarchegonium 41 is visible, cut tangentially along the egg cell wall (ecw) and showing wallprojections (wp) in TS. The egg cytoplasm of archegonium A2 has been torn away fromthe jacket layer (fle) but a small porlion is visible with the egg cell wall intact (arrow).Scale bar - 20 pm.D : Portion of archegonium A2 which was torn away from the jacket layer shown in C.Flame-like and peg-like wall projections (wp) protrude from the inner face of the egg cellwall (ecw) into the egg cytoplasm (ec). The prominent black body is typical of manyspecimens of mature archegonia. Scale bar = 20 pm.E : Jacket layers (jc) of archegonia A3 and A4, separated by a layer of femalegametophyte cells (fg). The egg cell walls (ecw) of both archegonia have numerous wallprojections (wp) protruding into the egg cytoplasm (ec). Scale bar = 20 pm.F : The middle portions of two archegonia (A1, A2) from the ovule shown in Fig. 4.30.Archegonium A2, with a pollen tube outside the neck cells, is close to fertilization. ln thisspecimen, the wall projections (wp), many of them branched (arrows), occur in irregularclusters, and protrude some 10 pm into the egg cytoplasm (ec). Scale bar = 50 pm.
EFig. 4.29
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o P. taxifoliao P. ferruginea_ 5-.
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FFig.3.1
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Fig. 3.2
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[..#Hll,';',i. IFig. 3.3
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Fig. 3.4
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Fig. 3.6
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Figure 3.8: Sporangial wall of the
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Figure 3.9: (Prumnopitys taxifolial
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Figure 3.10: Development of the mic
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Figure 3.1 1: (Prumnopitys taxifoli
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Figure 3.12: Germination of the mic
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Figure 3.13: The exine, intine and
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Figure 3.14: Cellular and free-nucl
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Figure 3.15: Germinated pollen grai
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Figure 3.16: Development of the mal
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Figure 3.17: Pollen tube and body c
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Figure 3.18: The body cell nucleus
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Figure 3.19: Targetting of archegon
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Figure 3.20: The male gametes in Pr
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Figure 4.1: Morphology and developm
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Figure 42 : Earl development of tlt
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Figure 4.3 : Initiation of fertile
Page 52 and 53: Figure 4.4 : The ovular complex at
Page 54 and 55: Figure 4.5: (Prumnopitys taxifolial
Page 56 and 57: Figure 4.6:The nucellus cone before
Page 58 and 59: Figure 4.7: Post-pollination develo
Page 60 and 61: Figure 4.8: Transverse sections of
Page 62 and 63: Figure 4.9: Tissues of the one year
Page 64 and 65: Figure 4.10: (Prumnopitys taxifolia
Page 68 and 69: Figure 4.12: Development of the meg
Page 70 and 71: Figure 4.13: Megaspore tetrads in P
Page 72 and 73: Figure 4.14: Development of the fem
Page 76 and 77: Figure 4.16: Occasionally two or ev
Page 78 and 79: Figure 4.17: ln Prumnopitys taxifol
Page 80 and 81: Figure 4.18: Features of the centra
Page 82 and 83: Figure 4.19: Characteristics of the
Page 84 and 85: Figure 4.20: The archegonium reache
Page 86 and 87: Figure 4.21: The developing central
Page 92 and 93: Figure 4.24: Stages in the maturati
Page 94 and 95: Figure 4.25: Volumes of thirty-thre
Page 100 and 101: Figure 4.28: Up to four archegonia
Page 104 and 105: Figure 4.30: Some characteristics o
Page 106 and 107: Figure 4.31: Another example of an
Page 110 and 111: Figure 4.33: Electron micrographs o
Page 112 and 113: Figure 4.34: Electron-micrographs o
Page 114 and 115: Figure 5.1: lntact and penetrated n
Page 116 and 117: Figure 5.2 Material from the pollen
Page 118 and 119: Figure 5.3: ln Prumnopitys taxifoli
Page 122 and 123: Figure 5.5 After fertilization, the
Page 124 and 125: Figure 5.6: Unfertilized archegonia
Page 126 and 127: Figure 5.7: Changes in unfertilized
Page 128 and 129: Figure 5.8: An unusual archegonium
Page 138 and 139: Figure 5.13: Outside the newly cell
Page 142 and 143: Figure 5.15: ln Prumnopitys taxitol
Page 144 and 145: Figure 5.16: Five-celled and eight-
Page 146 and 147: Figure 5.17: Some proembryos can ha
Page 148 and 149: Figure 5.18 : ln Prumnopitys taxifo
Page 150 and 151: Figure 5.19: ln Prumnopitys taxitol
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Figure 5.20: The middle of the susp
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Figure 5.21 : ln Prumnopitys taxifo
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Figure 5.22: ln Prumnopitys taxifol
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Figure 5.23: ln Prumnopitys taxifol
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Figure 5.24: Within the female game
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Figure 5.25: Transverse sections of
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Figure 5.26: One embryo was observe
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Figure 5.27: The dehiscence zone in
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Figure 5.28: Transition between hyp
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Figure 5.29: In the germinating emb
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Figure 5.30 : Further tissue develo
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Figure 5.31: In the germinating emb
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