ones. The perithecia appear as minute black immersed bodies at the 

 center of old areas. 



The disease was first described by Van Breda de Haan in West 

 Java and was later treated in some detail by Wakker and "Went (93). 

 Butler gives an account of the disease as it occurs in British India 

 (10) and Cobb (15) makes short mention of its presence in Hawaii. 

 It has been reported several times from Cuba (38, 39) and is known 

 to be present in the British West Indies (5). The senior author 

 collected it in Santo Domingo. Averna-Sacca (100) gives an account 

 of it as it occurs in Sao Paulo, Brazil. 



Spegazzini (73) describes two species of Leptosphaeria on cane as 

 new, but neither fits the description of the present species although 

 one is called L. sacchari Speg. Neither produced definite .spots, nor 

 was more than a dweller on dead leaves or stalks. 



A smaller leaf spot very closely resembling that just described 

 occurs to a limited extent but has not been found in fruiting condition. 

 It may in fact be only an abnormal type of the Leptosphaeria spot. 

 What is apparently the same thing has been mentioned in Cuban 

 publications (39). (PI. XXV, fig. 12.) 



Leptosphaeria sacchari van Breda de Haan 



Hyphae hyaline to dark, hypogenous, arising from oval gray spots, 

 unbranched ; conidia dark, 3-5 septate, obtusely angled, central cell 

 larger than apical cells, 20 X 9 mu. Perithecia minute, 120-150 mu. 

 diameter, black, formed beneath the stomata, paraphysate; spores 

 3-septate, center cells larger than apical cells, 20-24X5 mu., brown- 

 ish. Producing a leaf si)ot of cane. Description after Butler. 



Porto Rico. — On living cane leaves, Juncos, July 27, 1915, 2924; 

 Eio Piedras, Nov. 1916, 5849, June, 1917, 6552 ; Cambalaehe, March 

 28, 1916, 5089; Quebradillas, Dec, 1916, 5849; Arecibo, Jan. 1917, 

 6210. Common everywhere. (PI. XXV, fig. 1; pi. XXXI, figs. 5, 6.) 



BROwisr LEAF SPOT. {Cercospora longipes.) 



This is one of the rarer leaf spots in Porto Rico and is of interest 

 chiefly because of the fact that, although of no importance here, it 

 is considered in British India as a very serious source of loss. It 

 again serves to illustrate how the various fungi vary in their severity 

 in the different cane regions. 



The spots produced by this fungus are quite typical although they 

 may be at times confused with those due to nelminthosporium. They 

 are elongate oval in shape, w ith a definite margin, a deep brown in 

 color, appearing the same on both sides of the leaf, averaging one 



204 



