110 



OEGANOGRAPHY AND GLOSSOLOGY. 



It must be observed that this arillode, starting from the micropyle, which is very 

 near the hiliim, unites at a very early stage with the funicle, of which it appears to 

 be an appendage, but its origin may be recognized in very young ovules. In the 

 Nutmeg, the fleshy and honeycombed envelope of the seed, which forms the aromatic 

 substance called mace, may be looked upon as an expansion of the micropyle. In 

 Euphorbia (fig. 619), the circumference of the micropyle, which formed at first a 

 little swelling, thickens enormously after fertilization, and forms a small fleshy disk, 

 of which the central canal, at first filled with the conducting tissue, becomes by 

 degrees stopped up. In Poly gala (fig. 620), the little three-lobed 

 body at the base of the seed has the same origin as the disk of 



621. ABcleptas. 



Seed (111:11.0 

 with hairy arillode. 



(119. Euphorbia. 620. Polygala. 



Scot! crowned by See.l capped by a 



a fleshy arillode cartilaginous arillode 



(mag.). (mag.). 



622. 



ITenrtscaw. 

 Seed (mag.). 



62;t. CheUdoninm. 



Seed cnt 

 vertically (mag.). 



Euphorbia, and the micropyle is visible long after fertilization. In Asclepias (fig. 

 621) the tuft of hairs which crowns the seed is also an arillode proceeding from 

 the micropyle. 



The name of strophioles (strophiolce, carunculai) has been given to excrescences on 

 the testa which are independent of the funicle or micropyle, as the glandular crest 

 which in Heartsease (fig. 622) and Chelidonium (fig. 623) marks the passage of the 

 raphe ; the cellular mass which in Asarum (fig. 624) extends from the hilum to beyond 

 the chalaza, and the tuft of hairs at the chalaza in Epilobium (fig. 625). The 

 name aril having been indifferently applied to true arils, arillodes, strophioles, &c., it 

 would be advisable to keep this term as a general name for excrescences of various 

 sorts which appear upon seeds, and to limit the meaning by an adjective indicating 

 their origin. We should thus have & funicular aril (Willow, Nymphcea, Yew}; a 

 micropylar aril (Spindle-tree, Euphorbia, Polygala, Asclepias) ; a raphean aril 



(Chelidonium, Asarum} \ a chalazian aril (Epi- 

 lobiuni), &c. A second adjective might denote 

 its membranous, Jleshy, hairy, &c. texture. 



i;:'.">. rpilobiuui 

 C'lmluzian tuft of hairs. 



IVrboris. 



2ti. Tine. S> cd cut 



Kmbryo vertically (mag.), 

 (mag.). 



Walnut. 

 Seed 

 o;it vertically. 



' iipcuta. 



fl'2it. Lime. Kmhn c, , ,,i|, ,| 



Kmbryo spread round its 



out (mag.). albumen (mag.). 



Embryo or Young Plant. In most phaeuogamic plants the embryo is dicotyledonous, 



