3IO YORKSHIRE NATURALISTS UNION. 



In addition to attacking various kinds of cultivated plums, 

 the fungus also deforms the fruit of the sloe, bullace, and bird- 

 cherry " (Mass. Text-Book of Plant Diseases, pp. 85-88, f. 12). 



2153. Exoascus deformans Fckl. [Asccfiuyces. B.i . 

 N.E. — Scarboro', on peach leaves (cultivated). Popularly 



known as " leaf curl." (Mass. Text-Book of Plant Diseases, 

 pp. 82-85, f. 11). 



2154. Exoascus turgid us Sadeb. [Ascoviyces tnrgi.ius 

 Phil. Brit. Disc. ; Taphrina hetuUmt Rostr.] . 



N.E. — Scarboro', on Betiila alba (' Nat.' June '04). 



"This forms the familiar dense tufts of branches on the 

 silver birch. Witches 'brooms'" (Alass. Text-Book of Plant 

 Diseases, p. 89). Other clustered branches of similar appear- 

 ance, common on silver birch, are due to the work of a mite 



called Phytoptus rudis. 



TAPHRINA Fr. 



2155. Taphrina aurea Fr. [Ascomyces aureus ]\Iagn. ; 

 Exoascus aureus Sadeb. ; E. populi Thum.l . 



N.E. — Scarboro', on black-poplar leaves. 



PHYCOMYCETES. 



MUCORACEjE. 



PILOBOLUS Tode. 



2156. Pilobolus crystallinus Tode. 



S.W. — Halifax, 1784, on horse and cow dung (Bolton, Tab. 

 133 f. i). Very common on horse and cow dung in fields 

 everywhere. Records numerous for each county division. 



2157. Pilobolus Kleinil \'an Teigh [P. yonW«5 Curr.] . 

 N.W. — Bowes {■■'■'■ Nat.' Sep. '03). On cow dung. 



2158. Pilobolus roridus Pers. [Mucor roridus Relh.]. 

 S.W. — Halifax, on horse dung in fields (Bolton, Tab. 132 



f. 4). Nr. Hebden Bridge, on rabbit dung; Elland Park Wood, 

 on horse dung (Fl. Hx.). Huddersfield (F.F. '95). Stain- 

 borough (F.F. '97). 



N.E. — Scarboro', on cow dung. 



S.E.— Escrick (F.F. '96). 



Trans. Y.N.U., 1905 (pub. 1905). Bot. Series, Vol. 6. 



