EUCALYPTUS PTYCHOCAEPA. 



of thicker consistence, much larger and proportionately also broader, without any translucent oil- 

 dots, in the absence of stomata on the upper page of the leaves ; further in the umbels not solitary 

 nor lateral nor axillary, in larger flowers and conspicuous development of flower-stalklets, in fruits 

 often smaller (although similarly shaped and ridged) and in the seeds provided with a long 

 appendage (those of E. miniata being quite exappendiculate). 



The alliance of E. ptychocarpa to E. Watsoniana is so much more remote, as to render a 

 detailed exposition of their specific differences unnecessary. The leaves of E. ptj^chocarpa show 

 on transverse section their chlorophyllous parenchyma-cells mostly in seven rows. The same 

 numbers of series occur in E. calophylla, E. corynocalyx, E. diversicolor and E. viminalis, but in 

 E. globulus these cells are stratified in eleven layers. Extended observations may however prove 

 the numbers of the series, as above given, subject to some variation, but they may within certain 

 limits be of diagnostic value. In the leaves of young seedlings of E. viminalis the number of 

 cell-strata was found the same as in the leaves of aged trees, but the cells are smaller. 



Explanation of Analytic Details. — 1, unexpanded flower, the lid lifted ; 2, longitudinal section of an 

 unexpanded flower ; 3, some stamens in situ ; 4, 5 and 6, back-, front- and side-view of an anther with portion 

 of its filament ; 7, style and stigma ; 8 and 9, transverse and longitudinal section of a fruit ; 10 and 11, fertile and 

 sterile seeds ; 12, portion of a leaf ; 1-7 and 10-12, variously magnified ; 8 and 9, natural size. 



Explanation of Lithooeam of EtroALYPTtrs Leaves, the sections vektical. — 1, Eucalyptus piychocarpa : 

 a, cuticle; h, epidermal cells; c, parenchyma-cells in 5-7 rows, 7 prevailing, with chlorophyll; d, grit-cells (scle- 

 renchyma) ; e, breathing pores (stomata) on the lower side only. — 2, Eucalyptus calophylla : a, cuticle ; h, epider- 

 mal cells ; c, parenchyma-cells in 6-7 rows, 7 prevailing, with chlorophyll ; d, grit-cells ; e, breathing pores on the 

 lower side ouly ; /) oil-gland ; g, oleo-resin. — 3, Eucalyptus globulus : a, cuticle, b, epidermal cells ; c, parenchyma- 

 cells with chlorophyll in about 11 rows ; e, breathing pores (occurring on both sides, but the upper portion of the 

 section omitted on account of the thickness of the leaf) ; fand g, oil-gland, containing oleo-resin. — 4, Eucalyptus 

 viminalis : a, cuticle ; b, epidermal cells ; e, parenchyma-cells, in 5-7 rows, 7 prevailing, with chlorophyll ; d, grit- 

 cells ; e, breathing pores on both sides. — Augmentation in all these instances 214 times, diametrically measured. 



