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Micromorphology

Prunus ovule initiation and development

White bar = 0.075 mm.

White bar = 0.075 mm.

White bar = 0.075 mm.

White bar = 0.075 mm.
Fig. 9.
Partially dissected ovary with two collateral ovule primordia. Pistil has differentiated a style.
Fig. 10.
Early ovule development - initiation of inner integument below nucellus and obturator on margin of ovary wall.
Fig. 11.
Later stage, following initiation of outer integument. Top of style has differentiated into a stigma.
Fig. 12.
Two mature ovules. Each associated with an obturator.

A= stamen; C= Petal; ii= inner integument; K=sepal; N=nucellus; O=ovule;
Ob= obturator; oi=outer integument; Sg=stigma; Sy=style

 

Vauquelinia stamen and gynoecium initiation

Black bar= 0.05mm

Black bar= 0.05mm

Black bar= 0.05mm
Fig. 92.
Floral apex following initiation of petal primordia and whorl of 10 stamen primordia.
Fig. 93.
Five more stamen primordia and shallow gynoecial ring primordium in centre of floral apex.
Fig. 94.
Five more stamen primordia. Individual gynoecial primordia have developed from the ring primordium, but remain continuous along their common bases (arrow head).
A1-3=stamen whorls; C=petal; G=gynoecium; H=hypanthium ("floral cup")

 

Vauquelinia ovule initiation and development

White bar= 0.1mm

White bar= 0.1mm

White bar= 0.1mm

White bar= 0.1mm
Fig. 96.
Two dissected ovaries, each with two ovule primordia.
Fig. 97.
Developing ovules following initiation of integuments and obturator.
Fig. 98.
Later stage than Fig. 97. Integuments elongate dorsally as the ovules develop.
Fig. 99.
Mature ovule with funicular obturator. Note elongate nature of integuments.
ii=inner integument; N=nucellus; O=ovule; Ob=obturator; oi=outer integument; Sg=stigma; Sy=style

 

Photinia stamen and gynoecium initiation

White bar=0.05mm

White bar=0.05mm

White bar=0.05mm
Fig. 4.
Floral apex following initiation of petal primordia and whorl of 10 stamen primordia.
Fig. 5.
Floral apex following initiation of two more whorls of 5 stamen primordia.
Fig. 6.
Floral apex following initiation of distinct gynoecial ring primordium in centre of floral apex.
A1-3=stamen whorls; C=petal; G=gynoecium

 

Photinia ovule initiation and development

White bar=0.05mm

Black bar=0.05mm

White bar=0.05mm

Black bar=0.05mm
Fig. 8.
Partially dissected ovary with two collateral ovule primordia. Pistil has differentiated a style.
Fig. 9.
Two ovule primordia following the initiation of integuments.
Fig. 11.
Two developing ovules following the initiation and early development of funicular obturators.
Fig. 12.
Two mature ovules in adjacent ovary locules.Each is associated with a large papillate funicular obturator.
F= funiculus; ii=inner integument; N=nucellus; O=ovule; Ob=obturator; oi=outer integument; Sg=stigma; Sy=style

All photographs on these pages copyright © Rodger Evans 1999.

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Please send your comments to revans@maine.edu; last updated 1-November-99