408 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
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Schizonella Schrot. 
Cohn’s Beitr. Biol. Pflanz., 2 : 362. 1877. 
( Geminella Schrot., Abh. Schles. Ges., Abth. Nat. Med., 1869-72 : 6. 1869. p. p.) 
Type: Schizonella melanogramma (DC.) Schrot. 
Host: Carex digitata. Chaillet in Jura. 
Sori in the leaves, forming black agglutinated spore ??msses ; 
spores in pairs , produced serially in the fertile threads, arising by 
internal division of a mother cell, usually becoming somewhat laxly 
connected by the bulging of contiguous surfaces or sometimes sep¬ 
arating into individual cells, of medium size; germination by means 
of a short promycelium, the cells of which give rise to sporidia as 
with Ustilago. 
Only a single species, with a variety, comes under this genus, 
i his species has Carex for its host and is rather widely distributed. 
Sometimes the spores occur in threes, instead of twos, and very 
often they separate into the individual cells which are then thinner 
walled and lighter colored on the side of previous contact. The 
genus is very similar to Mykosyrinx and at one time their species 
were placed together. The agglutinated characters of the sori and 
the general color of the spores show some relationship to Cintractia, 
Schizonella melanogramma (DC.) Schrot. 
Uredo melanogramma DC., El. Er., 6 : 75. 1815. 
Caeoma melanogramma Schl., Linnaea, 1: 238. 1826. 
Puccinia melanogramma Ung., Einf. Bodens, 217. 1836. 
Thecaphora melanogramma Lev., Ann. Sci. Nat., Bot., in, 8 : 373. 1847. 
Ustilago destruens afoliicola Hausm., Erb. Critt. Ital., 1300. 1865. 
Geminella foliicola Schrot., Abli. Schles. Ges., Abth. Nat. Med., 1869-’72 : 
6. 1869. 
Urocystis pusilla Cke. & Pk., Rep. N. Y. State Mus. Nat. Hist., 25 • 90 
1873. 
Ustilago ambiens Karst., Oefv. Iv. Svensk. Vet. Akad. Forh., 29 : 108. 1873. 
Geminella melanogramma Magn., Hedw., 14: 19. 1875. 
Schizonella melanogramma Schrot., Cohn’s Beitr. Biol. Pflanz., 2 • 362 
1877. 
Entyloma ambiens Johans., Oefv. K. Svensk. Vet. Akad. Forh., 41 9 - 160 
1884. 
Exsiccati: Geminella foliicola Schrot., on Carex Pennsylvania, Thiirn., 
