104 
IOWA ACADEMY OF SCIENCES 
The Exoasceae have been made the subject of many excellent papers by 
European and American mycologists. We would call attention to those 
of Sadebeck\ Johanson% Robinson*, Rostrup^ Atkinson®, Patterson" and 
Farlow''. 
Because of the economic importance of the genus Exoascus to some 
of our cultivated fruits and ornamental plants many papers have been 
written on the subject; the following American writers having touched or 
discussed the diseases produced by it: Farlow", Erwin F. Smithy Gal- 
loway^", PammeP\ StewarP^ Atkinson^* and Pierce^^ 
In addition to the papers of Sadebeck, Rostrup, and Johansen, who 
touch upon some of the species affecting forest trees, the following auth- 
ors of text books pay some attention to the subject: Hartwig^®, TubeuP", 
Comes^^ FranlP", Sorauer^", Zopf-", DeBary-\ Brefeld*''*, and Prillieux*". 
The following species are known to affect forest trees in this country: 
Taphina aurea, T. caerulescens, T. virginiana, T. ulmi, Exoascus institae, 
E. varius, E. amentorum, E. aesculi, E. ^asteriospermus and E. nanus. 
The following have been found by the writer in the Rocky Mountains E. 
R UnterRucliungen uber die Pilzgattung, Exoascus, und die durch dieselbe 
urn Hamburg bervorgerufenen Baurakrankbeiten. Jabrbucb D. Hamburgiscben 
Wissenscb. Anstalten. 1883. 93-124. pi. 1-4. 1884. 
Kritiscbe Untersucbungen uber die durcb Tapbrina-Arten bervorgebracbten 
Baumkrankbeiten. I. c. 1890 24. pi. 1-5. Jabrb d. Hamb. Wissenscb. Anst. 8. 
Die parasitiscben Exoasceen. Eine monograpbie 110. pi. 1-S. 1893. Jabrb. d. 
Hamb. Wissenscb. Anst. 10. 
2. Om svampslagtet Tapbrina ocb dit borande svenska Arter. Ofversigt K. 
Vet. Akad Forbandl 1885 : 29-48 pi. 1. Studier ofver svampslaget Tapbrina. 
Bibang till K. Sv. Vet. Akad. Handl 13 : 1-29 No. 4. pi. 1. 1887. 
3. - Notes on tbe genus Tapbrina. Annals of Bot. 1 : 163-176. 
4. Tapbrinaceae Daniae. Danmarks Tapbrinaceer. Vidensk. Meddel. 
natur b. Foren. 1890 : 246-264. Separate 21. 
5. Notes on some Exoasceae of tbe United States. Bull Torrey Bot. Club. 
21: 372-379. 
Leaf curl and Plum pockets. Bull. Cornell. Univ. Agrl. Exp. Sta. 73 : 319- 
355. 20 pi. 
6. A study of North Am. Parasitic Exoasceae Bull. Lab. Nat. Hist. St. 
Univ. la. 3. 3 : 89-135. 4 pl- 1895. 
7. List of Fungi found in tbe vicinity of Boston. Bull. Bussey Inst. 1 : 
438. 2 : 227. 
8. An Exoascus on cultivated cberry. Proc Soc. Prom, Agrl. Sci. 7 : 25. 
1886. 
9. Field Notes. Jour. Myc. 6 : 107-108. 7 : 88-95. 7 : 375. 
10. Rep. U. S. Dept. Agrl. 1887: 366-369. pi. vj. 
11. Notes on some Fungi common during tbe season of 1892 at Ames, Iowa. 
Agr. Sci. 7. 20-27. Diseases of Plants at Ames 1894. Proc. la. Acad, of Sci. 
2 : 304. 
12. Carden and Forest 8 : 269. 
13. Bull. Cornell Univ. Agrl. Exp. Sta. 73. 
7. Newton B. Pierce in bis valuable monograph upon Peach Leaf Curl, 
exhaustively discusses the morphology and biology of Exoascus deformans as well 
as the treatment recommended for controlling tbe disease. This work also con- 
tains a very full bibliography. 
Peach Leaf Curl : Its nature and treatment. Bull. Div. Veg. Pbys. & 
Path. U. S. Dept. Agrl. 20: 204. SO pi. 1900. 
15. Lebrbuch der Baumkrankbeitem. 115. Textbook on the Diseases of Treas. 
131. 
16. Pflanzenkrankheiten 167. 
17. Crittogamia Agraria 161. 
18. Die Krankheiten der Pflanzen. 2 : 241. (2 Ed.) 
19. Handbuch der Pflanzenk 2 : 274. 
20. Die Pilze. 437. 
21. Comparative Morphology of the Fungi. Mycetozoa and Bacteria. 265. 
22. Beitrage zur, Morphologie der Pilze, 1 : 33. 
23. Maladies des Plantes. Agricoles et des arbres fruitiers at forestiers 
causees par des parasites vegetaux. 392. 
