DISEASii OF CYCLAMEN. 13 



on the leaves suggested a physiological trouble, resulting perhaps 

 from injudicious watering or some unfavorable cultural condition- 

 rather than the effect of the presence of a fungus. The spots were 

 circular, slightly water-logged in appearance, and with sharply 

 defined outlines, adjacent cells being normal in color and seemingly 

 rigid. 



CULTURAL STUDIES OF THE PARASITE. 



A microscopic examination of the diseased material revealed the 

 presence of mycelium, and at the expiration of a week, the leaves 

 meanwhile having been kept in a moist chamber, mature perithecia 

 had developed. These perithecia proved to belong to the genus 

 Glomerella. the ascogenous form of several anthracnoses. a 



The material was regularly examined and it was found that the 

 spots retained their definite form and a conidial stage did not precede 

 the perfect one. Cultures from the ascospores were made and a Col- 

 letotrichum developed. A later collection of leaves showed the Col- 

 letotrichum in great abundance, and cultures made from these spores 

 produced the Glomerella stage, thus unquestionably establishing the 

 relationship of the conidial and ascogenous stages of the fungus. In 

 every cultural experiment the perfect stage was developed in from 

 eight to ten days. An anthracnose caused by Colletotrichum attack- 

 ing cyclamen has been reported by Halsted.^ but no technical descrip- 

 tion having been found a discussion of its probable identity with 

 the conidial stage of the fungus here described can not be attempted. 



DESCRIPTION OF THE NEW VARIETY. 



Glomerella rufomaeulans (Berk.) Spaulding and Yon Schrenk cyclaminis 

 nov. var. 



Conidia. — Acervnli aniphigenous. brownish, large: conidia oblong or linear 

 obovate. straight or slightly curved, ends rounded. 12 to 15 /x by 4 to 5 /&; 

 basidia long, slender; seta? few, short, rigid. 



Perithecia. — Perithecia densely gregarious in definite light-colored round 

 spots, brown, membranaceous, subglobose or distinctly rostrate, ostiolate; asci 

 8 spored, clavate-cylindric, apex pointed, short stipitate, 50 t<» »;." n by vr> 

 to 9 fi ; spores subbiseriate, oblong to elliptic, 10 to 18 m by 4 to 4.5 /x. 



A NEW SPECIES OE STEMPHYLIUM ON ORANGES. 



Specimens of oranges affected by what is locally known as - end- 

 rot n in Arizona were received from grower- in that Territory in 1907 

 and again in 1908. The trouble was described as causing consid- 

 erable loss from the falling of the fruit. Specimens in the early 



Shear, C. L.. and Wood, Anna K. Ascogenous Forms of Gloeosporium and 

 Colletotrichum. Botanical Gazette, vol. 43. April. 1907, pp. 25D-266. 



6 Ha 1st ed. B. D. Report. Botanical Department, New Jersey Agricultural 

 College Experiment Station, 1893, p. o'JO. 

 171 



