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Yorkshire Naturalists at York. 349 



for producing fungi than in its usual flooded condition, and the following 

 species were here noted. :■ — ■ 



Amanitopsis fitlva, frequent, *Russula citrina 

 esculent R. xerawipelina 



Collybia dryophila Psathyra corrugis 



Laccaria laccata Boletus chrysenteron 



Lactarius sitbdiilcis Polyporus beHiliniis on Birch 



*Lentinus lepideits, on old Fames annosus on Conifers 



railway sleeper Tubaria furfuracea 



Skipwith Common : A common mushroom, Psalliota campestris, 

 growing frona roadside dust, and the dung-loving species, Stropharia 

 semiglobata, a single dried -up specimen, were the only records. 



[Rhytisina acerinum was observed sparingly on Sycamore leaves 

 near Fulford]. 



Micro-Fungi (F. A. Mason). — Heslington, Tillmire and Askham 

 Bog produced a number of species of ' rusts,' ' smuts ' and other parasitic 

 fungi. One crop of wheat at Heslington was suffering severely from 

 ' blight,' Cladospofiuni herbanim, a cereal pest more usually associa.ted 

 with wet seasons, and under such dry conditions as have been experienced 

 during the present summer one hardly expected to see it so rampant. 

 Two fields of wheat showed a fair amount of ' bunt,' Tilletia Tritici. 

 Oats and barley were mostly free from serious fungus diseases, although 

 occasional ears of barley were attacked by the ' covered smut,' Ustilago 

 Hordei . 



Species of special interest seen at Askham Bog were Melampsora 

 Larici-epitea on Salix cineria, and the aecidia of Puccinia Lolii on the 

 leaves and berries of Rhamnus Frangula. A fungus attacking the 

 inflorescences of the Marsh Thistle was found to be Ustilago Carditi. 

 The latter is an uncommon species, and Cirsium palustre is probably a 

 new host for it. 



The most noteworthy species observed at Skipwith was Claviceps 

 purpurea, the ' ergot ' of rye. Although the ears of corn attacked by 

 this parasite greatly interested the members, its appearance would not 

 be welcomed by the farmer. So far as could be estimated, from 5 to 8 

 per cent, of the ears of one crop of rye were attacked by this pest, and some 

 of the specimens weie unusually large ; one ergot measured 3* 5 cms. in 

 length. A photograph of this fungus, collected at Skipwith, is reproduced 

 herewith. 



The following is a list of the species obtained from the three districts 

 visited : — 



A = Askham Bog ; T=Tillmire ; S = Skipwith. 

 * New to Mid -West Div. (V.C. 64). 



Uromyces Ficariae Lev., on Celandine, A, T. 



U. Poae Raben., on Celandine, A. 



Puccinia Centaureae D.C., oil Centaurea nigra, A. 



P. Leontodontis Jacky, on L. Hispida, A. 



P. Taraxici Plowr., on T . officinale, A. 



P. Menthae Pers., on M. aquatica, A. 



P. Violae D.C., on V. canina, A, T. 



P. Caricis Reb., on Urtica dioica and Carex acutijormis , A. 



P. Lolii Niels., on Rhamnus Frangula, A. 

 *P. glumarum Er. et Henn., on Triticum vulgare, T. 



P. Poarum Niels., on Tiissilago Far far a, A. 



Triphragmium Ulmariae Wint., on Spiraea Ulmaria, A. 



Phragmidium Sanguisorbae Schrot., on Poterium Sanguisorba, A. 



Zenodochus carbonarius Schlecht., on Sanguisorba officinalis, A. 



Coleosporium Tussilaginis Tul., on T. Farfara, A. 



Melampsora Larici-epitea Kleb. (emend. Fischer), 



on Salix cinerea, A. 



1921 Oct. 1 



