Apr, »i, 1923 
Cultivated and Wild Hosts of Cane Mosaic 
249 
The graces tested with negative results are given in the following list: 
Cultivated cir6ps^ 
Peifennials-- 
- Madake bamboo... Phyllostachys quiliou 
. r ,^dib^ bamboo..... Phyllostachys pubescens. 
Para grass... Panicum harhinode. 
Napier grass. Pennisetum purpureum var, 
Merker grass. Do. 
Australian giant-grass... Do. 
Johpson grass... .Holcus halepensis. 
Annuals— 
Wheat, Pow^r Fife (C. I. 3697). . . 
Oats, Swedish Select (C. I. 134)_ 
Rye, Von Runker No. 2 (C. I. 174) 
Barley, Marionet... 
Rice, Blue Rose (C. I. 1962). 
Tebsinte... 
Redtop.... 
Timothy.... 
Bluegrass. 
Ragi millet.. 
Ornamentals: 
Perennials— 
Variegated Eulalia... 
Do. 
Annual— 
Job’s-tears... 
Wild grasses: 
Perennials— 
Broom sedge. 
Broom sedge.. 
Little bluestem. 
Indian reed. 
Gama grass. 
Annuals— 
Green foxtail.. 
Red sprangletop___ 
.Triticum aestivum, 
. Avena saliva, 
.Secale cereale, 
.Hordeum vulgare. 
: Oryza saliva. 
.Euchlaena mexicana, 
.Agrostis palustris. 
.Phleum pratense. 
. Poa pratensis. 
.Eleusine coracana. 
Miscanthus sinensis variegatus, 
Miscanthus sinensis zebrinus, 
Coix lachryma-jobi. 
.Andropogon virginicus, 
.Andropogon elliottii. 
.Andropogon scoparius, 
.Sorghastrum nutans. 
. Tripsacum dactyloides. 
Chaetochloa viridis. 
Leptochloa filiformis. 
It is noticeable that although plants have been selected for experiment 
from the entire grass family, the ones which proved susceptible are without 
exception confined to the tribes Paniceae, Andropogoneae, and Tripsaceae. 
In his phylogenetic arrangement of the genera of grasses, Hitchcock (9) 
divides the grass family into 13 tribes and places the 3 tribes here men¬ 
tioned together as representing the highest type of development. It is 
significant that this arrangement, based on morphological characters, 
should prove so regular with respect to susceptibility to this disease. 
Since it is to be expected that closely related species are more likely to be 
affected by the same diseases than species located remotely from one 
another, the relationships are corroborated in an interesting and novel 
manner. 
The possibility of the existence of more than one type of mosaic among 
the grasses has been mentioned. A type of mottling in the edible bamboo 
(Phyllostachys pubescens) from China resembles our mosaic very strikingly. 
It was first observed in one plant out of a lot of four being held in the 
detention house at Washington. Subsequently two other plants became 
affected. The writers have no experimental evidence that this is an 
infectious disease. It was found impossible to infect this species of bam¬ 
boo with the sugar-cane mosaic. Furthermore, it is not nearly related to 
any o^er grass found susceptible to our mosaic but stands at the extreme 
opposite end of the list of tribes of the grass family. 
A specific mosaic of Nicotiana viscosum distinct from the mosaic of 
iV. tabacum has been reported by Allard (r), who states that the mosaic o£ 
