ea ent: RE a) Sieh Sete) Nee abe OF tat MD BES oe nee 
` 
RE A ERr aE ES A AE A GRINS y A a Og ith A ig E E a n PSF te Ai Pe a oy 
SUMMARY 49 
into the ovary cavity and float about in the slime there. Ovaries 
have been sectioned showing the micropyles filled with these 
bodies. Occasionally in this region teleutospores are formed in 
small scattered groups on the leaf surface. 
Generally the floral parts suffer first and most from this fungus, 
although some plants are found with the growth evident only on 
the leaves. The affected plants are earlier in seasonal develop- 
ment than uninjured plants, as reported by Rennert (21, p. 250). 
Infected pistillate flowers develop early and the ovaries enlarge as 
after fertilization, but, as far as the writer’s observations go, do 
not produce seed. It is a question whether or not normal embryo- 
sacs are developed. Plants once infected may live two or three 
seasons, but finally succumb to the ravages of the parasite. The 
appearance of rust on plants in culture the year following an early 
transplanting and removal of all stalks and leaves from the corm 
suggested the presence of perennial mycelium in the corm. Later 
examination of corms of infected plants has shown abundant 
mycelial threads in both the body of the corm and the terminal 
bud. Halsted (15) in 1894 made a brief report of observations on 
the distribution of the aecidia and teleutospores of U. Caladii on 
A. triphyllum but did not suggest the perennial nature of the 
mycelium. 
SUMMARY 
The additions and corrections presented in the present work 
may be briefly summarized as follows: 
There is a very wide range in the time of KRE EER of the 
flowers, and a marked tendency toward the earlier development of 
staminate flowers. 
The tapetal nuclei wander among the developing pollen spores 
in the anther cavity. 
The ovule and the embryo-sac are of the lily type. 
The ovary cavity is filled at maturity with slime produced by 
special hairs of the inner stigmatic brush. 
A well-developed and i permanent suspensor system is 
evident. 
One daughter of the primary endosperm nucleus (fusion 
nucleus) undergoes two to four divisions while migrating to the 
micropylar end of the embryo-sac, and the resulting free nuclei 
