ArPENDix. 229 



little transverse bands consisting of short parallel black lines, 

 T V of an inch or more in length ; spores globose, very minute.— 

 On stems of Aira aquatica and A. caspitosa. Uncommon. (Plate 

 VI. figs. 120-122.) 



Ustilago longissima, Tul. Elongated Smut; produced 

 on the leaves in linear, Ion?, parallel, dirty-olive patches ; epi- 

 dermis bursting- longitudinally; spores globose, breaking up into 

 minute granules, olive-black.— On leaves of Poa aquatica and 

 fluitans. Summer. Common. (Plate V. figs. 105-107.) 



Ustilago hypodytes, Fr. Grass-culm Smut; produced on 

 the culms beneath the sheaths, afterwards exposed ; spores 

 minute, subglobose, brownish-black.— On the culms of various 

 Grasses. Summer. Sometimes not uncommon. (Plate V. fiars. 

 100, 101.) 



Ustilago segetum, Ditm. Corn Smut; produced on the 

 receptacle and rachis ; epidermis soon ruptured ; spores loose, 

 minute, gloOose, black.— On the ears of Corn and Grasses. Au- 

 tumn. Very common. (Plate V. figs 98, 1)9.) 



Ustilago typhoides, B. and Br. Heed Smut; produced 

 on the stems of reeds, forming thick bullate patches several inches 

 long, occupying whole internodes, covered by their sheaths; spores 

 globose, rather large. — On stems of Arundo phragmitis. Autumn. 

 Not uncommon. (Plate VI. figs. 128, 129.) 



b. Epispore violet. 



Ustilago Candollei, Tul. Developed in the ovary; mass 

 of spores blackish-violet ; spores globose, ovoid-globose, and a 

 little flattened (about '01 1-014 mm.) ; epispore smooth, dull rosy- 

 violet.— In the ovaries of Polygonum Hydropipera.nd other species. 



B. Spores with a granular epispore. 



Ustilago Montagnei, Tul. Beaksedge Smut ; produced 

 on the seeds; epidermis bursting; spores slightly angular, small, 

 dark-coloured, intermixed sparingly with fragile filaments. — On 

 seeds of Rhyncospora alba. Not common. (Plate V. figs. 96, 97.) 



Ustilago urceolorum, Tul. Sedge Smut; produced on 

 the glumes and utricles; epidermis soon bursting ; spores in a 

 compact mass, afterwards breaking up, globose, rather large, 

 granulated.— Surrounding the seed of various Carices ; as, Carex 

 pracox, stellulata, recurva, and pseudo-cyperus. Autumn. Not 

 uncommon. (Plate VI. figs. 109-111.) 



