129 



S. E. Gillii Maiden. A shoot (Botanic Gardens, Sydney, 11th April, 1919), has 

 leaves at base, one in threes, then four whorls in twos, the rest in threes. 

 The leaves connate. Ternate leaved alike in the seedlings and in the sucker 

 leaves from a tree. Figured in Part LX, fig. 6, Plate, 247. 



9. E. goniocalyx F.v.M. Triphylly. Quoted by Mueller in " Eucalyptographia " 

 under E. viminalis. 



10. E. Johnstoni Maiden. (Muelleri T. B. Moore). Botanic Gardens, Sydney 



(Coll. W. F. Blakely.) 



11. is. Muelleriana Howitt. Triphylly rare. (A. D. Hardy, loc. cit.) 



12. E. pachyloma Benth. Triphylly. Kalgan Plains, W.A. (J.H.M.) 



13. E. patens Benth. For an instance of triphylly, see fig. 1, Plate 88, Part XX, 



of the present work. 



14. E. piperita Sm. Triphylly in a tree at Hornsby, near Sydney (W. F. Blakely). 



15. E. radiata Sieb. Triphylly figured at fig. 3, Plate 29, Part VI, as E. amygdalina. 



Triphylly about 1 in 100 of certain seedlings. (A. D. Hardy, loc. cit.) 



16. E. resinifera Sm.\"' Polyphylly. The undermentioned species yielded forms 



17. E. Risdoni Hook. J with increase of foliar leaves supervening on tricotyly." 



In E resinifera, triphylly in 1 in 530 of certain seedlings (p. 241). In 

 E. Risdoni, triphylly in 1 in 100 of certain seedlings (p. 241). (A. D. Hardy, 

 Proc. Roy. Soc, Vict., xxviii (New Ser.), p. 242.) 



18. E. umbra R, T. Baker. Cowan, near Hawkesbury River, N.S.W. (W. F. 



Blakely and.D. W. C. Shiress.) 



19. E. viminalis Labill. Case of triphylly shown in " Eucalyptographia " plate. 



See also a specimen from Lake St. Clair, Tasmania. (L. Rodway, 17th 

 January, 1918.) 



c. Cohesion. 



" Velenovsky mentions a seedling of E. pulverulenla in which one cotyledon only was present, as a 

 consequence of which the foliage leaves above were alternately arranged. It is possible that each leaf 

 in these cases represents a congenital fusion of two." (" Principles of Plant Teratology," Wordsell, i, 220.) 



I do not think I have seen a seedling with only one cotyledon, except it has been 

 removed by an accident, but alternately arranged leaves immediately above the 

 cotyledons are not rare. 



We have cohesion of cotyledonary leaves in E. punctata DC, the seed from Como, 

 Sydney (J. L. Boorman and W. M. Carne). I have also seen it in E. setosa R.Br. 

 (Northern Territory), forming a symmetrical cup. I have not specially searched for 

 this form of cohesion. 



d. Margin. 



In the same plant we may have one cotyledon strictly reniform (marginate), 

 and the other more or less emarginate. 



If the three principal groups of cotyledon leaves be studied, it will be seen that 

 they chiefly differ in the degree of emarginateness ; in other words, in examining a 

 complete series of Reniformse and Bilobee (which two groups contain a minimum amount 

 of it), and of Bisectse (which contain it in its extreme form), we have a perfect series. 



