138 DR. J. W, HESLOP HARRISON ON 



Ecologically, I had expected to do remarkable work but 

 my expectations have been thwarted by influences beyond my 

 control. Despite this, even in that branch, my labours have 

 not been without their value. I have been enabled to present 

 novelties in the way of associations and successions which 

 some future worker may adequately expand. In the meantime 

 an account of their presence and composition will not be 

 valueless in stimulating the efforts of toilers far more favour- 

 ably situated for such work than we on the North-East Coast 

 can ever be. 



Co rn'ge /ida . --On pages loi, 102, 103, 105, 106 for Parnassius 

 read Parnassia. 



APPENDIX. 

 The Uredinaceae of the Marshes. 



In view of the production, in some future time, of a P'ungus 

 Flora of Northumberland and Durham, it has been considered 

 advisable to give some account of the "Rusts" observed 

 during the progress of the previous work. 



Uromyces, Link. 



1. Uromyces Valerianae, Fkl. Very plentiful in the TroUins 

 marsh, affecting the young leaves of Valeriana dioica and 

 V. sambucifolia. So like are the latter in their young stages 



to those of Parnassia pain stris that one can pardon the errors 

 of De Candolle and Cooke in thinking that plant was affected 

 too, and therefore describing a mythical species on the 

 strength of their opinion. 



2. Uromyces li/nonii, Lev. Extremely abundant in Greatham 

 Marsh on leaves of Statice limofiium, the leaves of almost 

 every plant supporting crowds of teleutospores. 



3. Uromyces geranii, O. & W. Quite rare in the Billingham 

 Marshes on Geranium pratensc. 



4. Uromyces ficariae, Le'v. Wide spread in Billingham 

 Bottoms in May on Ratmnculvs Fie aria. 



5. Uromyces junci, Tul. Very destructive to leaves of 

 Pulicaria dysenterica in the Troliius Marsh, utterly destroying 

 the plants so that new growth is necessary to secure their 



