INDEX TO AMERICAN BOTANICAL LITERATURE 355 
Among these diseases are the chestnut blight, Lophodermium nervisequum, Perider- 
mium fructigenum, Myxosporium acerinum, and Phoma piciena. 
Spillman, W. J. The present status of the genetics problem. Science 
IT. 35: 757-767. 17 My 1912. 
Sturgis, W.C. A guide to the botanical literature of the Myxomvycetes 
from 1875 to 1912. Colorado Col. Publ. Sci. 12: 385-433. 1 Je 
1912. 
Swingle, W. T. Observations sur quelques espéces indo-chinoises des 
genres Afalantia et Glycosmis. Not. Syst. 2: 158-160. 20D 1911; 
161-163. f. 7. 25 Mr 1912. 
Taylor, N. Our native shrubs and what may be done with them. 
Garden Mag. 15: 166-168. Ap 1912. 
Taylor, N. Some modern trends in ecology. Torreya 12: I110-II7. 
My 1912. 
Theissen, F. Zur Revision der Gattung Dimerosporium. Beih. Bot. 
Centralb. 29: 45-73. 12 Ap 1912. 
Includes several American species. 
Thornber, J. J. Botany. Ann. Rep. Univ. Arizona Agr. Exp. Sta. 
Thornber, J. J. Native cacti as emergency forage plants. Univ. 
Arizona Agr. Exp. Sta. Bull. 67: 457-519. 20D 1911. 
Includes notes on cultural work, a key to the species, etc. 
» 0.1. Purity and germination of agricultural and vegetable 
seeds sold in North Carolina. North Carolina Dept. Agr. Bull. 
94; 5-78. $1. 7-8 + f. 1, 2. O 1011. : 
Tullsen, H. Some Dakota wild flowers. Am. Bot. 18: 1-7. F 1912; 
35-39. My 1g12. [Illust.] 
Vaupel, [F.] Echinocactus nidulans Quehl. Monats. Kakteenk. 22: 50. 
15 Ap 1912. [Illust.] 
Vaupel, F. Fiinf neue, von J. N. Rose beschriebene Opuntien. Monats. 
_Kakteenk. 22: 60-62. 15 Ap 1912. 
— H.de. Oenothera nanella, healthy and diseased. Science I. 35. 
. ‘93, 754. 10 My 1912. 
7, R.A. Letter to the members of the American Fern Society. 
oo Jour. 2: 58-62. 11 My 10912. 
P hag J. Conservation ideals in the improvement of plants. 
°P: Sci. Mo. 80: 578-586. Je 1912. 
2 W. Cereus platygonus Otto. Monats. Kakteenk. 22: 50- 
36. 15 Ap 1912. 
Influence of crossing in increasing the yield of the 
> 
t 
ee, ON. Y, Agr. Exp. Sta. Bull. 346: 57-76. Mr 1912. 
