90 
IOWA ACADEMY OF SCIENCES 
Peridermium (Aecidium) pini acicola occurs on the needle of pines 
and produces its teleuto stage upon certain composites like Senecio. 
Peridermium pini-corticola occurs on the branches of pine. 
Coleosporium, senecionis (Pers.) Fr. being the perfect form of this 
fungus. An interesting Peridermium-like fungus has been described by 
Pr'^f. B. T. Gallov/ay^ on Pinus virginiana. This fungus is connected witii 
Coleosporium pini. 
Gaeoma pinitorquum and C. laricis have also been connected with 
a teleuto form. We are especially indebted to Hartig^ for an account of 
the biology and life history of the former and PlowrighP has determined 
the connection of the latter. Hartig has also obtained infection results 
with C. laricis on Populus tremula, Melampsoro tremulae laricis. It 
would seem therefore that tw’o forms of Caeoma occur on Larix. Caeoma 
agree? with Peridermium, except in the absence of the peri dial layer. 
The chief systematic works describing our species of Peridermium are 
those of Saccardo^ Winter'’, Schroeter®, Rees’^, Plowright®, and Von 
Thumen'-*. 
There are several allied fungi like Caeoma pinitorquum and G. laricis 
which are connected with species of Melampsora. The former with 
Melampsora tremula, Tul. and the latter with M. hetulina, (Pers.) Tul. 
Economic accounts have been given by Hartig’”, Sorauer”, TubeuP'^ 
Ward’®, Willkomm’^ Frank’® and DeBary’”. 
The American species ha.ve been described by Farlow”, Sargent’®, 
Peck’”, Von Thumen®”, Underwmod and Earle®’. 
The anatomy of P. elatinum has been treated by Dr. A. P. Anderson®®, 
and in a general way was described by DeBary®®. However, the spec- 
ies are still in a very unsettled state. In Sargent’s Silva are the 
1. Bot. Gazette ~ 2 : 433. Jour. Myc. 7 : 44. 
2. 'Wiclitige Krankbeiten der WaMbaume. 83. pi. 5. f. 1-9. 
Text book of tbe Diseases, etc. 166. 
3. Einige Impversucbe mit Kostpilzen. Zeitseb. f. Pflanzenk, 1 : 130. 
Text book of tbe Diseases, etc. 169. 
4. Syll. Fung. 7 : 835. 
5. Die Pilze Deutseb. Oest. und d. Sebw. 256, 257, 260, 261, etc. 
6. Die. Pilze Scblesiens. 367-381. 
7. Die Rostpilzformeu d. Deutseb. Coniferen Halle. 1. c. 
8. A Monograph of tbe Britisb Uredineae and Ustilagineae. 
9. Die Blasenrostpilze der Coniferen. Monographic der Gattung Periderm- 
ium Lev. Mittb. ans dem forstl. Versuchswesen Oest. 2 : 297-323. Vienna. 1880. 
10. Wiclitige Krankh. d. IValdb. 1. c. Lehrbueb. L c. Textbook 1. c. 
11 Handbuch der Pflanzenkrankheiten. 2 : 244, 246, 250, 252. 
12. Pflanzenk. 383, 386, 390, 393. 
13. Timber and Some of its Diseases. 256. 
14. Die Mikroskopischen der Feinde des Waldes. 1868. 
15. Die Krankbeiten der Pflanzen. 2; 185, 187, 189, 196, 206, 209. 
16. Untersuchungen uber die Branpilze and die durcb sie verusachten 
Krankbeiten der Pflanzen und andere Nutzpflanzen mit Rucksiebt auf das Getreide. 
103. Berlin. 1853. 
17. Appalachia 3 : 239. Proc. Acad. Arts and Sci. 20 ; 320. Bull. Torrey 
Bot. Club 8 : 8.5-87. 
18. Silva of N. Am. 11: 12. 12: 26. 
19. Rep. N. Y. State Museum of Nat. Hist. 25 : 91. 27 : 104. 28 : 61, 86. 
Bull. Torrey Bot. Club. 6: 13. 
20. 1. c. 
21. Notes on Pine-inbabiting species of Peridermium. Bull. Torrey Bot; 
Club. 23 : 400. See also Underwood and Earle Bull. Agrl. Exp. Sta. 80 : 213 ; 
Underwood, Moulds, mildews and mushrooms, Earle in Mohr's Plant Life of Ala- 
bama Contr. U. S. Nat. Herb. 6: ]92. 
22. Ueber abnorme Bildung von Ilarzbebaltern und andere zugleicb auftre- 
tende anatomisebe Veranderungen in Holze erkrankter Coniferen Inaug. Diss. 
Univ. Munchen. 1896. 
Bot. Gazette 24: 309-344. PI. 14-15. 1897. 
23. Ueber den Krebs und die Ilexenbesen der Weisstanne Bot. Zeit. 1867 : 
260. 
