348 PHILOSOPHICAL KOTEi OX 



Galipea macrophylla has a " peel " which covers more than 

 half the ovary, and is as closely applied to it as the peel of a 

 Valencia orange. It has, moreover, a staminal tube surmounted 

 l)y two fertile and five sterile stamens, the latter looking un- 

 commonly like the sterile stamens or digits of the monstrosity we 

 call digitate Citrus (vide Fig. 159), though of course the latter 

 arc very much larger. 



Ticorea jasminijlora has a disk like that of Ruta and a 

 staminal tube, consisting of seven stamens, two of which are 

 fertile, and five with broad foliaceous filaments surmounted by 

 barren anthers.* 



Ravenia Rosea and Coleonema album have regular disks, or 

 what I would call incipient " peels." 



Medicosma Ci(n??i)tf/hami has a staminal tube, from which 

 the orange peel might easily have been born, while within it there 

 is a disk, which is made up of separate bilobed segments, 

 and undoul)tedly represents a whorl of sterile and atrophied 

 stamens. 



Then Peltostigma j)teleoides, below its ovary, has a disk, or 

 staminal cushion, from which an indefinite number of stamens 

 emerge, like that of the Pasony. This cushion being in more 

 than one whorl would indicate that tlie disk proper in other 

 genera is only ii. part of the staminal cushion. 



We come now to the Citrtis, which has a tendency, by the 

 fusion of its stamen-filaments into groups, to form a staminal tube, 

 within this is the disk proper, which we must now look upon as 

 a part of the staminal cushion, and above the disk is the peel 

 proper, entirely enclosing the carpels proper, and fusing with the 

 carpel styles. 



The digitate Citruses undoubtedly show us that the orange 

 peel is made up of distinct segments, like the sterile stamens of 

 Galipea Macrophylla^ though much larger. 



In the " Gardeners' Chronicle "of 29 March 1890, p. 399, there 

 is a notice of the "Cultivated Oranges and Lemons of India and 

 Ceylon." It is stated that in the opinion of the elder De Candolle, 

 " Organogenic Vegetale," p. 41, the peel or rind is an enlargement 

 of the di.sk. Of course it is. But what is tliti disk, but a fusion of 



* These barren anthers are noteworthy, because they are like the glands 

 ou the teeth of the young Cherry leaf (Fig. 86). 



