NOMAD FUNGI. 
31 
those which I have mentioned above, no doubt the fact would soon 
have forced itself upon the mind. No one could long contemj)late the 
orderly procession of the three forms on the same plant without being 
compelled to acknowledge the probability of their genetic connection. 
But, unfortunately for the mycologists of the past, the case was by 
no means so simple. Many species of CEcidium were, and still are, 
known which are not succeeded by a Uredo or a Pucciuia on the same 
plant. Many Uredos were, and a few still are alone, unaccompanied 
by either an QEcidium or Puccinia ; while there is a considerable 
number of species of Puccinia with which no CEcidium or Uredo was 
or is even now known to be associated. Still another fact complicated 
the matter. Allowing that a Puccinia is preceded by an CEcidium, it 
seems that we must not always look for the CEcidium upon the same 
or even upon an allied plant. Sometimes we shall find the CEcidium 
upon a Dicotyledon, wliile the Uredo and Puccinia luxuriate upon a 
Monocotyledon. This, which is known as heteroicism, is a curious fact, 
and is especially the case with those species such as Puccinia (jrnminis, 
P. coronata, P. poamni, P. magnmiana, and P. caricis, which grow upon 
grasses and sedges in their final stage. These are called Jietcrcccious 
species, and their CEcidia are found respectively upon Berberis, 
Bhamnus, Tussilago, Bumex, and Urtica. 
(To he continued.) 
\ 
GEOLOGY OF ^YYKE FOREST. 
BY A. H. ATKINS, B.SC. 
In a former number of this Magazine an article appeared by Mr. 
Blatch describing an entomological ramble in Wyre Forest. As this 
place is one of the most beautiful still left to us in the Midland 
Counties, I have written this brief sketch not as a complete scientific 
description, but merely as an outline of the chief geological features, 
sufficient, I hope, to show that in this branch of Natural History also 
much mav be found to interest and instruct. 
The forest covers an undulating district, and is drained in great 
part by Dowles Brook, a little tributary of the Severn, which it joins 
about a mile above Bewdley. Up this rivulet we may wander for live 
or six miles through a valley bordered by hills, covered not, however, 
by the mightier monarchs of the forest, but by groves of saplings, 
which, crowded thick together, give a picturesque appearance, 
especially when the light of the setting sun is seen creeping up the 
slopes till the verdant summits above are tinged with the departing 
rays. The trees are felled every seven years, and are used—the trunks 
for supports in mines and sewers, and the branches for charcoal. 
Geologically, the forest lies almost entirely on sandstone belonging 
to the Coal Measure series, and forms part of Wyre Forest Coalfield. 
