Contributions to the Life-History of Callitris. 
BY 
W. T. SAXTON, M.A., F.L.S. 
Lecturer in Botany at the South African College , Capetown. 
With Plates XLV and XLVI. 
Introduction. 
T HE genus Callitris was incidentally referred to in two accounts of the 
life-history of Widdringtonia recently published by the writer (13, 16). 
The present study has been carried on conjointly with that of Wid¬ 
dringtonia, and, as was stated in the last published account of the latter 
genus (16), the facts there reported will be discussed in connexion with the 
corresponding phases in the life-history of Callitris in the present communi¬ 
cation. 
The methods employed are similar to those reported in the study of 
Widdringtonia (13) and need not be repeated here. 
Callitris is an Australasian genus consisting of about a dozen closely 
allied species. So closely, in fact, do different species approximate that 
even with ample material it is no easy matter to discriminate between them. 
The material used has been collected entirely in the Government plantations 
in the neighbourhood of Cape Town, mainly in those at Tokai. 
I desire to express my thanks to the following gentlemen who have 
assisted me in the collection of material, &c.:— 
To Mr. J. J. Boocock for bringing material from the Tokai plantations 
on twelve occasions ; to Mr. W. C. Worsdell, F.L.S., for collecting and 
fixing material for me on three occasions during a visit to the Tokai Forestry 
School; to Mr. G. A. Zahn for bringing material on two occasions from the 
Tokai plantations; to Mr. G. A. Wilmot, M.F., Forest officer in charge of 
the Tokai plantations, for giving me every facility for collecting material 
while staying at the Tokai Forestry School; to Mr. G. H. Ridley, curator 
of the Municipal Gardens, Cape Town, for germinating seed of Callitris and 
Widdringtonia for me in the municipal greenhouses. 
[Annals of Botany, Vol. XXIV. No. XCV. July, 1910.] 
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