CAULIFLOWER DISEASE. 
127 
Description of Figures. 
1. Strawberry plant infested by Aphelenchus fragarics. 
a. Scaly buds developed in the axils of normally developed leaves— h. 
b. A very swollen stem, with 
c. Rudimentary flower buds always remaining closed. 
d. Accumulation of rudimentary buds at the base of the branch b. 
e. Cauliflower-like accumulation of strongly branched and broadened 
inflorescent parts, with imperfectly developed flowers and sheath¬ 
ing-leaves. 
/. Section of similar Cauliflower growth. 
g. Accumulated blossoms, partly rudimentary, partly abnormally, 
developed, such as are shown separately in 2 and 3. 
h. Portion of leaf stalks of normally developed leaves. 
i. Stunted leaves of fairly normal shape. 
2. Monstrously developed blossom ; outer leaves of the calyx narrow ; inner 
calyx leaves more developed, some very thick and twisted, others 
branched, and a few trifid like ordinary leaves; the blossom appears to 
have split into three divisions, but the petals, stamens, and pistil of 
these parts have remained rudimentary and indistinguishable from 
each other. 
3. Monstrously developed blossom ; outer leaves of the calyx narrow; inner 
leaves of calyx well-developed, but a few of them twisted; petals of 
corolla stunted, and some of them twisted, and no sign of pistil or 
stamens. 
4. Abnormally developed stamen. 
The figures opposite, are copied, by permission of Dr. J. Ritzema Bos, from a 
portion of the illustrations given in his paper on “The Cauliflower Disease of the 
Strawberry, caused by Aphelenchus fragarice, nov. spec.,” entitled “De Bloemkool- 
ziekte der Aardbeien, veroorzaakt door Aphelenchus fragarice , nov. spec.,” door 
J. Ritzema Bos (voorloopige mededeling). Overgedruckt uit het Maanblad voor 
Natuurwefenschappen, No. 7, Jaargang, 1889. 
In availing myself of the courteous permission of Dr. Ritzema Bos to extract 
from his pamphlet, it is but right to mention that with the accompanying figures 
I have only inserted a portion of the elaborate numberings and details given in the 
original paper. As my report is for general use, these minutely scientific details 
would be out of place here; but in extracting from his work I am bound to mention 
the elaborate minuteness of the paper from which I give some main points. 
