127 



.1892. Lubbock. 



" Host of the species of Eucalyptus observed have characters in common in the form of the cotyledons- 

 They are transversely oblong, with or without a shallow sinus at the apex, with a short midrib terminating 

 in the sinus, and a longer lateral nerve running along the centre of the lateral lobes. They are practically 

 therefore trinerved; but the whole of the venation is sometimes obscure or indiscernible owing to the 

 opacity of the cotyledons. The real apex of the latter is in the notch ; and the length of the lateral lobes, 

 together with the origin of the sinus is explained below. Species agreeing in the main with the above 

 particulars are E. globulus (fig. 339), E. rostrata, E. cordata, E. leucoxylon (fig. 340), and E. stellulata. A 

 slight modification of the above is seen in E. coccifera having small, obcordate cotyledons with a cuneate 

 base. A greatly exaggerated form is met with in E. occidentalis (fig. 342), where the lateral lobes are 

 ascending or suberect so as to give the cotyledons a furcate appearance strongly resembling those of 

 Pentapetes puniceus (see fig. 219, not reproduced) amongst the Sterculiacece , with similar venation. The 

 cotyledons of E. ficifolia are transversely oblong-reniform, with a moderately deep notch at the base, a very 

 shallow apical sinus, the three nerves copiously branched, and long ascending petioles. On the whole, 

 they may be compared to those of a Geranium. The long petioles show a transition to a still more 

 remarkable type occurring in E. marginata (fig. 343, not reproduced), in which the hypocotyl is subterranean 

 and extremely short, while this deficiency is compensated for by the length of the petioles. The lamina 

 is obcordate, cuneate and trinerved, resembling a Brassica. A striking departure from the common type 

 occurs in E. calophylla (fig. 344, not reproduced) having reniform-orbicular, incipiently emarginate, 

 pliaceous cotyledons of great size. The three nerves are copiously branched, the lateral ones again having 

 three main divisions." (Lubbock, i, 526.) 



A similar or identical case occurs in E. marginata, a transverse section of which shows the manner 

 of coiling round the radicle. Although the section showing the coil is transverse to the seed, it is really 

 through the longitudinal plane of the cotyledons. E. stellulata (fig. 341) has very much smaller and narrower 

 seeds, and the coiling is therefore less extensive. The. radicle is club-shaped, thickest at the point, and 

 central to the cotyledons." (Lubbock, " On Seedlings," i, 524.) 



The descriptions he gives in connection with the cotyledons are fuller than those 



of any previous author, and include : — 



E. globulus, deeply bifid, lobes obovate-oblong, diverging (with fig.). 



E. rostrata, small transversely oblong, obtuse, entire, sometimes almost cordate at 



the base. 

 E. cordata, very similar to those of E. rostrata, shallowly emarginate. 

 E. leucoxylon, as in E. rostrata, but truncate at the end, or sometimes possessing 



a small apical tooth (with fig.). 

 E. stellulata, transversely oblong. 



E. coccifera, shortly stalked, obcordate, cuneate at base, refuse at apex. 

 E. occidentalis, deeply bifid, petiolate, lobes oblong, narrow obtuse (with fig.). 

 E. ficifolia. reniform, obtuse, entire or slightly emarginate, cordate at the base. 

 E. marginata, sub-rotund or transversely oblong, obtuse, emarginate, asymmetrical 



petiolate (with fig.). 

 E. calophylla, large foliaceous, reniform-orbicular, petiolate, blunt, entire except 



at the base or incipiently emarginate (with fig.). 



1894. Kerner and Oliver in 1894 (in translation, presumably earlier in the 

 original) use the term bisected, for the cotyledons of certain species of Eucalyptus, i.e., 

 No. 15 of fig. 148 (i, 621) for E. orientalis (a slip for occidentalis). No. 16 of the same 

 figure is a reniform cotyledon of E. coriaceous (coriacea), but the word reniform is not 

 used. 



83989— C 



