ON ADOXA 161 
On Adoxa Moschatellina. March—May. Not uncommon. 
All parts of the plant are affected, rhizomes, 
petioles, leaves, peduncles and flowers. 
(Fig. 112.) 
Puceinia Adoxae and the ecidium of P. albescens 
(q.v.) are about equally common, but are rarely 
found together; they occur not only on different 
plants, but usually also in widely separated locali- 
ties. In fact, it is agreed by all observers that there 
are three cases, (1) where the zcidium alone occurs, (2) where the teleuto- 
spores alone occur, and (3) where they both occur together ; in the latter 
case uredospores are found with the teleutospores in the same sorus. The 
first is considered to be the ecidium of P. argentata (q.v.), the second is 
P. Adoxae, and the third is P. albescens. 
Soppitt first proved that the teleutospores of P. Adowxae, laid upon 
healthy plants when in active germination after passing the winter, 
reproduce the teleutospores in about ten days without the intervention of 
other spore-forms. It is therefore a Micropuccinia. Whether the wide- 
spreading mycelium is perennial or not is uncertain. Worth. G. Smith 
raised seedlings of Adowva from berries of an infected plant ; the seedlings 
exhibited the Puccinia from the earliest stages of growth, but we are not 
told what precautions were taken to prevent infection from outside. He 
also found (é.¢.) teleuto-sori, in a state of nature, on fusiform swellings 
of the underground parts of the plant (peduncles and petioles), as also on 
rhizomes and scales, in March ; the spores were irregular, one-, two-, or 
three-celled. In April the leaves, and in May the flowers and young 
fruits were infected. No mycelium could be found in the rhizome. If 
Plowright’s ascription of a perennial mycelium is incorrect, the infection 
must have first taken place, in this instance, underground on the young 
growth, and the mycelium gradually spread upwards. That this is 
probably the case is shown by Fischer’s experiment; he kept plants which 
had borne teleutospores in pots—if he removed all the leaves, they 
produced healthy growth next spring, whereas, if the leaves were left on 
and allowed to fall upon the soil, one plant at least (out of four) showed 
teleutospores on the new shoots. Bubdék inclines to the same opinion 
(Centralbl. f. Bakt. 2. xvi. 150). 
As will be seen from the synonymy, P. Adowae and P. albescens are 
united (under the former name) in Sydows’ Monographia, while Soppitt, 
Plowright, Bubék and Fischer consider them distinct. In any case they 
are very closely allied ; the probability is that P. Adoxae is a mutation 
from P. albescens which has acquired the habit of reproducing teleutospores. 
from teleutospores directly, while the original species from which it was. 
evolved still maintains all the three spore-forms, though two of them are 
Fig. 112. P. Adoxae. 
Teleutospores. 
GU. 1l 
