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54 THE BRITISH SMUT FUNGI<br />

included in the Ustilaginales. Representatives of 13 genera have been reported<br />

in the British Isles.<br />

Kerj to Families i<br />

a. Palm-Ieaf parasites . . . . . . • i • • Graphiolaceae<br />

a. Not palm-leaf parasites . . . . . . . ' . . . . b<br />

b. Promyceliiim transversely septate, sporidia lateral . . . Ustilaginaceae<br />

b. Promycelium non-septate, sporidia terminal . . • . . Tilletiaceae<br />

Key to Oenera<br />

of the Ustilaginaceae and Tilletiaceae reported in the British Isles<br />

Spores single . . . . . . . . . . . . b<br />

Spores in groups . . . . . . . . . . . . i<br />

b. Sori embedded in host tissue at maturity . . . . . . . c<br />

b. Sori not embedded in host tissue . . . . . . . . e<br />

Sori in swellings on roots, on Juncus . . . . . Entorrhiza p. 87<br />

(if on Eleocharis (Scirpus), see Ustilago marina, p. 75)<br />

Sori in leaves and stems . . . . . . . . . . d<br />

d. Spores dark in colour . . . . . . Melanotaenium p. 100<br />

d. Spores hyaline or light in colour . . . . . Entyloma p. 102<br />

Sori dusty at maturity . . . . . . . . . . . f<br />

Sori agglutinated at matiu-ity, on Cyperaceeie . . . . . Ointractia p. 78<br />

f. Sorus-covering a false membrane of fungus cells, on Polygonaceae<br />

Sphacelotheca p. 76<br />

f. Sorus-covering, if present, of host tissue . . . . . . . g<br />

Spores intermixed with sterile hyphal threads<br />

Spores not intermixed with sterile hyphal threads<br />

h. Spores large, usually 15-30 /i. diam. .<br />

h. Spores small to medium, usually 4^18 /i diam.<br />

Spores in twos, on Veronica . . . .<br />

Spores in balls . . . . . .<br />

j. Spore balls embedded in host tissue at maturity<br />

j. Spore balls not embedded in host tissue at maturity<br />

Spore balls having a cortex of sterilo cells, on aquatic plants<br />

Spore baUs without a cortex of sterile cells, on Primulaceae<br />

1. Spore balls having a cortex of sterile cells<br />

1. Spore balls without a cortex of sterile cells<br />

USTILAGINACEAE Schroeter,<br />

Krypt. Flor. Schles., iii (1), p. 266, 1887<br />

Tjrpe: Ustilago (Persoon) Roussel, 1806.<br />

Farysia p. 75<br />

. h<br />

Tilletia p. 81<br />

Ustilago p. 54<br />

Schroeteria p. 88<br />

j .<br />

. k<br />

1<br />

Doassansia p. 109<br />

Tuburcinia p. 90<br />

. Urocystia p. 92<br />

Thecaphora p. 80<br />

Spores usually exposed at maturity as a dusty or, less frequently, agglutinated<br />

spore mass. Spore germination by a septate promycelium bearing lateral<br />

sporidia or branches (see p. 20).<br />

USTILAGO (Persoon) Roussel,<br />

Flor. Calv., p. 47, 1806<br />

Type: Ustilago segetum Pers. on Gramineae, France..<br />

Synonym: Ustilagidium'SAtTherg, 1895.<br />

Sori in various parts of the host, especially the inflorescence. Spore mass<br />

powdery, usually dark in colour. Spores single, small to medium, usually<br />

4-18 fj. diam. Spore germination, see p. 20.<br />

Differs from Tilletia in the methods of spore formation (see p. 15) and germination.

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