No. 5.] USTILAGINE.E OF CONNECTICUT. \"J 



oblong, dusty spore mass about 6-10 mm. in length ; this is very 

 temporarily protected by a thin transparent membrane, and 

 upon dispersal of the spores nothing remains but the naked 

 rhachis. The spores are lighter colored on one side, sub- 

 spherical to spherical, or occasionally more elongated, minutely 

 echinulate, especially on the lighter side, and chiefly 5-9^ in 

 length. 



Host and Distr. : Hordeum vidgare, Storrs, 1901 ; New 

 Haven, July 8, 1902, June 15, 1904; Whitneyville, Sept. 24, 

 1902 ; Westville, July 7, 1903. 



This is the loose smut of barley, and is rather common in 

 the fields of this crop. The smuts of barley, oats, and oat 

 grass, as will be seen by the descriptions, are very similar, in 

 fact were not long ago considered one species. It requires 

 the modified form of the hot-water treatment to prevent the 

 loose smut of barley. 



Ustilago Panici-glauci (Wallr.) Wint. Fig. 49. The 

 sori occur in all of the spikelets, are ovate, 2-3 mm. in length, 

 and at first protected by thin transparent glumes, but soon rup- 

 ture these, and scatter the dusty black-brown spore mass. The 

 spores are dark reddish brown, ovoid, spherical or sometimes 

 more elongated, prominently and abundantly echinulate, and 

 10-14,(4 in length. 



Host and Distr. : Setaria glauca, Southington, Aug. 8, 

 1902; Bridgeport, Sept. 15, 1902; Berlin, Oct. 3, 1902; Glas- 

 tonbury, Oct. 23. 1902; Andover, Sept. 15, 1903; New Canaan, 

 Sept. 29, 1903 ; Manchester, Oct. 2, 1903. 



Throughout the United States this is a common smut on 

 the yellow fox-tail grass, though it does not occur on the 

 green fox-tail. 



Ustilago Rabenhorstiana Kuhn. Fig. 50. The sorus 

 involves the entire inflorescence, changing it into a linear or 

 oblong body, 3-5 cm. in length, which is usually hidden by 

 the enveloping leaf sheath ; it is covered for a short time by a 

 very fragile transparent plant membrane, and within the dusty 

 brown-black spore mass are often elongated remains of the 

 plant tissues. The spores are reddish or olive brown, ovoid 

 to spherical, or occasionally slightly angled, echinulate to ver- 

 ruculose, and 10-14^ in length. 

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