159 
eh E Tilletia de Baryand, x 150. 
Por of surface of spore of Tilletia rugispora, 
sot ng the dark epispore cracked into irregularly 
polygonal — : Bor white lines correspond to the 
hyaline epispore 000. 
p ^ Spore of Tilletia vuditiólids x 750. 
50. 
en 
sS PEA - 2 mixta, x 7 
n de AN » fusca, x 750. 
51 erebrina 
2. 50. 
a da: Portion of an ear of wheat infected with Tilletia Caries, 
na 
» 14. Spore of Tilletia Cari €— 
„ 15. Two sporidia of Tilletia Caries that have conjugated 
and produced sporidiola ei Tulasne), x about 460. 
» 16. Spore of Tilletia endophylla, 
„ 17. Spore of Tilletia separata pontilantitg (after Brefeld), 
CH 
US ELE Bof of Tilletia controversa, x 150. 
19 levi. 5 
» 19, 5 "s evis, 
u. " 5 separata, x 750. 
jj el. i Lolii, x 150. 
» me. - - verrucosa, x 150. 
» de. u v US x 750. 
» 94. $s s: -Horden x 150. 
DCLVII.—CENTRAL AMERICAN RUBBER. 
(Castilloa elastica, Cerv.) 
Some account of Castilloa rubber, and of the species producing 
it, was given in the Kew Bulletin for 1887, pp. 13-16. Since then 
attention in Mexico and the West Indies. It has not, however, 
been easy to obtain any trustworthy data as to the practical 
States Consular Reports (May, 1899, pp. 147-151). It appears to 
have been drawn up EU man conversant with the subject and 
with a good deal of care : 
* Consul-General Beaupré sends from Guatemala, under date of 
January 28, 1899, a translation of an artiele on rubber prepared by 
Mr. José Horta, 'of the city -- Guatemala. Mr. Horta, adds the 
the subject ably. Extracts from his report are given 
“In Guatemala ee elastica, Cerv., is Qon in the 
wild state, and co an immense zone in Central America ; 
the rubber which this. tree produces is one of the best and most | 
valuable for the indust 
“The Castilloa elastica is a tall, weéllahsped tree, with smooth, 
greenish-white bark. At a he eight of from 15 to 20 yards from 
the ground there start from the trunk (of spongy "ud porous 
3790 B2 
