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The following two specimens probably belong to this species : — 



1. Field of Mars, Gladesville, two trees close together, pointed out by J. J. Fletcher 



to R. H. Cambage and myself in February, 1905, and Mr. Cambage and I 

 collected specimens, while Mr. Cambage took admirable photographs of 

 the trees, which will be reproduced when Barks in the genus are arrived at. 



2. Galston-road, about 1 mile from Hornsby, Mr. Sutton's property (W. F. 



Blakely, 21st October, 1918). 



These two specimens apparently vary only in robustness from the type of 

 E. Penrithensis, the Galston specimen being from a young, vigorous tree, which would 

 account for this. 



AFFINITIES. 



This is an anomalous, rare, and apparently local species, and one naturally 

 looks upon it as a hybrid. At the same time, hybridism is difficult to prove. Of course 

 it is not necessary to prove that the assumed parents are to be found, at the present 

 time, in close juxtaposition to the individuals from which one obtained material in the 

 present case. The parents may be some distance away, and the seed of the trees may 

 have been conveyed in a number of ways. Possibly the parents are E. eugenioides 

 Sieb. and E. hcemastoma Sm. var. micrantha Benth. Let us consider these in detail. 

 (Original description.) 



Dr. Hall was also of opinion that his species {E. Marsdeni) might be a hybrid, 

 and he and I formed these opinions independently in regard to the practically solitary 

 specimens of E. Penrithensis and E. Marsdeni referred to. It will be best to give his 

 remarks from the original description litteratim : — 



" As seen from the description, this form of Eucalypt, on a cortical classification, seems intermediate 

 between the smooth-barks and stringy-barks. The timber has not the texture of that of the stringy-barks, 

 but more nearly resembles that of E. viminalis in physical characters. The early buds resemble those of 

 E. ohliqua, but there is no resemblance in the mature stage. The mature leaves are generally markedly 

 oblique. • The fruit resembles that of E. eugenioides, but it tapers more into the pedicel, and is not so flat ; 

 nor are the fruits so clustered on the peduncle. The seedUng is intermediate between those of E. eugenioides 

 and E. Moorei; and, in its hairy seedUng-leaves and reniform cotyledons, approximates strongly to the 

 stringy-barks. The reniform anthers also place it in that category, but the bark, timber, and oil are quite 

 distinct from those of this class. As, so far, only a single tree is known, one is strongly inclined to conclude 

 that it IS either a hybrid or a sport. Strong colour is lent to the hybrid theory by the fact of it possessing 

 so many of the characters of the stringy-barks, especially in the seedling stage; yet differing from them 

 in others in the mature stage, as, for instance, in the bark, oil, and timber. Since the only tree has, 

 unfortunately, lately been cut down, further comparison is at present impossible. Now that a description 

 has been published, search may reveal further specimens, and more definitely establish its status. The 

 tree was a young one, about 12-15 years old, and growing on land that had been mostly cleared, but with 

 a few well-grown trees of E. hcemastoma, E. resinijera, and E. sidcrojMoia in proximity. Other trees near by 

 were E. crehra, E. eugenioidex, E. hcmiiMoia, E. 'punctata, and E, tereticomis." 



E 



