ON RUBIACEE 163 
leaves on healthy plants on the 26th of April, removing them after a time; 
nevertheless the experimental plants showed both uredo- and teleutospores 
on May 16th. Their mycelium is localised, but that of the ecidium 
permeates the whole plant; it is a disputed point whether it perennates 
in the rhizome or not; Plowright affirms, Fischer denies this, and Bubék 
thinks it probably not perennial (Centralbl. fiir Bakt. 2. xvi. 150). 
Fischer records and figures abnormal three- or four-celled teleutospores. 
The distinctions between this species and P. Adoxae lie not only in 
the presence of the ecidium and uredo, but also in the appearance 
and character of the teleuto-sori. In P. albescens these are widely 
scattered and mostly single, and only follow the ecidium towards the end 
of May—in P. Adowae they are crowded in larger groups, on more or less 
deformed parts of the plant, and can be found as early as April or even 
March; moreover there are no uredospores in them. 
An ecidium on Adoxa is found in North America, but it has been 
said (Dietel, 1895) that teleutospores have only once been seen there on 
that host. On that account Dietel considers that the xcidium is able to 
reproduce its own spore-form. This is contradicted by Bubdk’s experi- 
ments and, since P. argentata is common in North America, it is more 
probable that the ecidium on Adoxa found there is not Medium 
albescens, but belongs to P. argentata. Bubdk, in fact, considers that this 
is the case with most of the records of P. albescens. He says that the 
zcidium of P. argentata has golden-yellow spores, and that he has met 
with the true Meidium albescens only from Yorkshire and Baden. I do 
not quite share this view: I have found teleutospores, apparently not 
mixed with uredospores, in mid-April, on the same plant on which were 
abundant ecidia with golden-yellow spores. There are three possible 
explanations of this occurrence: either (1) it was P. albescens with deep- 
coloured spores, or (2) there were on the same plant P. Adoxae and the 
eecidium of P. argentata (which is a very rare species in Britain), or (3) all 
the distinctions usually given must be upset. Which is the true explana- 
tion, future experiments alone can decide. 
36. Puccinia Asperule-odorate Wurth. 
Puceinia Asperulae Fckl. Symb. Mye. p. 56 p.p. 
P. punctata Lk. ; Sydow, Monogr. i. 213 p.p. 
P. Galit Plowr. Ured. p. 143 p.p. Fischer, Ured. Schweiz, p. 332, 
f. 246 (see ibid. p. 555). 
P. Asperulae-odoratae Wurth, Centralbl. f. Bakter. 2. xiv. 314, 
f. 9—10. 
Acidiospores. AXcidia hypophyllous, in little clusters, sur- 
rounded by a paler zone, cup-shaped, with a slightly projecting 
11—2 
