Fitzpatrick: Rostronitschkia 



167 



Specimens examined : 



Porto Rico, Maricao; H. H. Whetzel and E. W. Olive. Ex- 

 ploration of Porto Rico. No. 699, type (in N. Y. Bot. 

 Card. Herb. ; in Pi. Path. Herb. Cornell Univ. No. 9656 ; 

 and in Fitzpatrick Herb. No. 1023) ; N. L. Britton, J. F. 

 Cowell, Stewardson Brown, The New York Botanical 

 Garden, Exploration of Porto Rico No. 4557 (in N. Y. 

 Bot. Gard. Herb.), material of this collection described by 

 Rehm in a letter to Seaver as Nitschkia nervincola Rehm ; 

 F. L. Stevens, Univ. Illinois Herb. Nos. 207, 735, 3498, 

 3670, 6718 (in N. Y. Bot. Gard. Herb.) ; Mayagiics, F. 

 L. Stevens, Univ. Illinois Herb. No. 6725 (in N. Y. Bot. 

 Gard. Herb.). 



Jamaica, Richmond, Trinity Ville ; Mrs. E. M. Swainson (in 

 N. Y. Bot. Gard. Herb. Ellis Collection). Specimen 

 labeled Botrytis seriata Ell. & Ev. by Ellis. 



Explanation of Plate i i 



Fig. I. Upper surface of leaves of Gesneria albi flora parasitized by 

 Rostronitschkia nervincola. The diseased spots occur immediately opposite the 

 stromata, which are always hypophyllous. Natural size. 



Fig. 2. Lower surface of leaves of the same host showing the stromata of 

 the fungus in the secondary veins and midrib. Natural size. 



Fig. 3. A stroma of Rostronitschkia bearing coremia of the imperfect 

 stage. X II. 



Fig. 4. The same stroma photographed under different light conditions to 

 emphasize the whitish pruinosity at the apices of the coremia. X ii. 



Fig. 5. Mature perithecia of Rostronitschkia confluent in a single row on 

 the stroma. Note the prominent, sulcate beaks. X ii. 



Fig. 6. A younger perithecium in which the beak has not yet developed. 

 Several coremia of the imperfect stage appear at the right. X n. 



Fig. 7. Three mature perithecia, the beaks of which have been broken 

 away. X 11. 



Department of Plant Pathology, 

 Cornell University, 

 Ithaca, N. Y. 



