Jan. 1908] Cultures of Uredineae in igoj 7 



iter marginata, baud stipitata, disco coeruleo-livido, extus sericeo- 

 villosa usque ad marginem, fuscidule cinerea, pilis simplicibus, 

 rectis vel subcurvatis, interdum conglutinatis, obtusis, glabris, 

 septatis, 5oou long., usque ad apicem aequaliter 5-7/^ lat., sub- 

 hyalinis, fragilibus obtecta, 0.5-5 cm. diam., 0.5-2 cm. alt. Hy- 

 nienium plane involutum ! 



Volcano Atitlan, alt. 2700 m. Dept. Solala, Guatemala, 16 

 Feb. 1906, leg. W. A. Kellerman, no. 6204. 



Peziza pulcherrima, hymenio plane carens, secundum form- 

 am et excipulum. hirsutum forsilan Xeotiellae Cooke species. 

 Cfr. Sacc. Syll. VIII, p. 190. Similis videtur Lachnea Plumiera 

 Tr. (Sacc. Syll. VIII, p. 170) Americae cent. 



? On Cactus (Opuntia), Laguna (Lake Ama- 



titlan), Dept. Amatitlan, alt. 1200 m., 8 Feb. 1905, leg. W. A. 

 Kellerman, no. 6225. 



"Asci 40-46 X 25-32^, sporae 20-22 x 8,a hyalinae." 



Aegre fero, me plurimis microscopicis praeparatis intra 



excipula crasse tunicata modo ascos dispersos ovales sporas plane 



involutas includentes invenisse. Constructio Ascomycetis sus- 



picari licet ad Myriangiaceas pertinentem, baud Pyrenomycetem. 



CULTURES OF UREDINEAE IN 1907.^ 



BY J. C. ARTHUR. 



The present article forms the eighth of a series of reports- 

 by the author upon the culture of plant rusts, covering the years 

 1899 to the close of 1907. The grass and sedge rusts form a 

 prominent part of the year's \vork. the same as in previous seas- 

 ons, but it has been possible to include also some very interesting 

 studies of a number of species of Gymnosporangium. This was 

 chiefly brought about by two excursions made l3y my colleague, 

 Mr. F. D. Kern, and myself for the express purpose of securing 

 this sort of culture material, and for making observations re- 

 garding probable alternate hosts. The first trip was to Lake 

 Forest, 111., on April 6, where we secured G. clavipes, G. dava- 

 riaeforme and G. nidus-avis in the locality where the last two 

 were obtained by Dr. R. A. Harper for the distribution in Ellis 

 & Everhart's North American Fungi and Fungi Columbiani. 

 Explicit directions were given us by Dr. Harper to enable us to 



' Read before the Botanical Society of America at the Chicago meet- 

 ing, December, 1907. 



'See Bot. Gaz. ^9:268-276, j5:10-23; Jour. Myc. 5:51-56, 70:8-21, 

 ij:50-67, 7^:11-27 and 7^:189-205. 



