1. Studies on the phylloplane microflora of unsprayed ‘Dougherty’ apple trees. (Appendix F: an undescribed non-carotenoid, ballistosporous yeast.);Pennycook,1974
2. Spore fall as a quantitative method in phylloplane studies;Pennycook;Transactions of the British Mycological Society,1978
3. Seasonal changes in the apple phylloplane microflora;Pennycook;New Zealand Journal of Botany,1981
4. Bullera Derx;Phaff,1970
5. Sporobolomyces Kluyver et van Niel;Phaff,1970