318 
38 . CACTACE2E. 
Eltliam. 396. t. 295. f. 380 and clearly synonymous with the 
Dillenian pi. at p. 398. t. 296. f. 382, — a sp. not taken up hv 
Linnasus and partly confounded by him with his O. Tuna, but 
which is certainly at once the O. Dillenii (Ker) and the Canarian 
littoral copiously long and slender y.-spined y.-fld. pi. with 
purple pear-shaped fr., miscalled by Webb “ O. Tuna Mill.” 
and of which the diagnosis and correct synonym}^ stand thus : 
O. Dillenii (Ker) ; spinosissima pallide glauco-virens sub- 
liumiiis, artic. subabbreyiatis latiusculis rotundato-obovatis ova- 
libusve lat. |-| longitudinis aequante, spinis subulatis flavidis 
longis tenuibus validis confertis horridissima ; fl. luteis v. sul- 
phureis extus saepe rutilis v. rubescentibus, fr. elongato-pyri- 
formibus purpureis. — Cactus Dillenii Ker in Bot. Reg. iv. t. 255. 
Opuntia Dillenii Haw. Suppl. 79 ; DC. iii. 472 ; Wight 111. Ind. 
Bot. ii. 50. t. 114 (outer pet. with a red midrib, as occasionally 
in the Canaries). Opuntia Tuna WB. i. 209 (not O. Tuna 
Mill, or Cactus Tuna L.). O. amyclcea Ten. Fl. Nap. iv. 270. 
t. 236; DC. iii. 474. Cactus Opuntia var. C. (text), C. Opuntia 
tuna (plate) DC. PI. Gr. t. 138 (not Opuntia Tuna DC. Prodr. iii. 
472. n. 13). Tuna major spinis validis flavicantibus, flore sul- 
phureo, Dill. Ilort. Eltli. 398. t. 296. f. 382. Opuntia major , folio 
oblongo-rotundo, spinis longis et validissimis confertim nascen- 
tibus obsito, flore luteo, Sloane Hist. ii. 149. t. 224. f. 1. — Plab. 
in siccissimis apricis littoralibus Ins. Canariensium vulg. — Ap- 
proaches nearest to O. nigricans (Haw.)= Cactus Tuna y. nigri- 
cans BM. t. 1657, but differs notably by its shorter and broader 
more rounded joints which are mostly much less and never 
more than twice as long as broad, y. spines and sulphur or 
lemon-y. fl. It is called in G. Canary Tunera da India', and 
though not otherwise employed in raising Cochineal, the long 
(1-2 in.) and very slender spines are used generally in the Ca- 
naries for affixing the rags impregnated with the young insect- 
brood to the plants of the true O. Tuna L. The fr. is scarcely 
eaten. I have never seen this sp. either wild or cult, in Mad. 
Cactus cocci nidi for (or on the plates cochenillifer') of DC. PI. 
Gr. tt. 137 (two pi., viz. fl. and fr.) is referred by 1 )C. himself, but 
obviously by mistake and under the wrongname of Cactus Opuntia 
Tuna in Prodr. iii. 472, to 0. monacantha Willd., from which 
it is totally distinct by its tufted or many-fascicled rather short 
