549 
Dutt. — Pityostrobus macrocephalus , L. and H. 
Fig. 5. P. ovatus. Transverse section of cone. Cowderoy Collection, V 8309. Nat. size. 
Fig. 6. P. ovatus. Part of transverse section (Fig. 5) showing double nature of scale-trace 
supply ; r.c ., resin-canals ; app.r.c appendicular resin-canals accompanying the scale-traces. 
Cowderoy Collection, V 8309. 
Fig. 7. P. macrocephalus. Ovule A, Fig. 2, more highly magnified; n.c., nucellar column. 
Cowderoy Collection, V 11001 b. 
Fig. 8. P. macrocephalus. Upper part of ovule B, Fig. 3. Not quite median section ; Int., part 
of integument separated from main wall ; Nuc., nucellus; m.m., megaspore membrane ; End., en- 
dosperm tissue ; c.c., central cavity. 
Fig. 9. P. ovatus. Longitudinal section of an ovule from the base of the cone, not quite 
median ; N.I., double layer of nucellus and integument tissue shrunken from wall ; Nuc., nucellar 
tissue alone, with indication of beak ; Mg., small contracted megaspore. Cowderoy Collection, 
V 1 1001 e. 
Fig. 10. P. ovatits. Upper part of ovule showing peculiar nucellar apex ; n.c ., nucellar column 
which appears to penetrate endosperm; Nuc., nucellar tissue showing cellular structure clearly ; 
m.m., megaspore membrane. Cowderoy Collection, V 11003 c. 
Fig. 11. P. 7 )iacrocephalus. Longitudinal section of ovule showing large embryo and nucellar 
column. Sedgwick Museum. 
Fig. 12. P. macrocephalus. Another ovule from the same cone also showing an embryo, 
A whorl of cotyledons (cot.) is present with a growing point at the base. 
Fig. 13. P. macrocephalus. Nucellar column of ovule seen in Fig. 7, more highly magnified; 
pg., pollen-grains. Cowderoy Collection. 
Fig. 14. P. macrocephalus. Tip of same nucellar column still more highly magnified, showing 
two winged pollen-grains. 
Fig. 15. P. macrocephalus. Tip of nucellar column of ovule seen in Fig. 11, showing ger- 
minated pollen-grains and nucellar tissue perforated by pollen-tubes. 
