70 
BRITISH RYRENOMYCETES. 
Fam. 6. YALSEA3. Composite, stroma formed from the 
matrix. Perithecia distinct, circinating or seriate. 
Gen. 1. VALSA, Fries. Perithecia collected in tufts, immersed 
in the bark, disposed in rings, ostiola convergent, erumpent, form- 
ing a disc. 
A. Sporidia sausage-shaped , hyaline. 
Sub. -Gen. 1. Coaronophora, Fckl. 
1. Y. gregaria, Lib., Sacc. Syll. 413. 
On twigs. Brentry, near Bristol. 
Sub.-Gen. 2. Eutypella, Sacc. Ostiola sulcate. Asci octosporous. 
2. V. prunastri, Fr., Sacc. Syll. 566. 
On species of Prunus. 
3. Y. sorbi, Schm., Sacc. Syll. 568. 
On Sorbus aucuparia. Twycross. 
4. Y. stellulata, Fr ., Sacc. Syll. 571 ; Hdbk. 2461. 
On maple. King’s Cliffe, Pentrich, Eltliam Grove. 
On elm. Forden. 
5. Y. ailanthi, Sacc., Sacc. Syll. 577 . 
On Ailantlius glandulosa. Kew Gardens. 
6. Y. microspora, C. Plow., Sacc. Syll. 589. 
On beech. Terrington, Norfolk. 
7. Y. tetraploa, B. fy C., Sacc. Syll. 595 ; Hdbk. 2478. 
On dead sticks. Elmhurst. 
Sub.-Gen. 3. Leucostoma, Ntke. Disc white, cinereous, or 
yellowish. Ostiola not sulcate. Asci octosporous. 
8. Y. nivea ( Hoffm .), Sacc. Syll. 533 ; Hdbk. 2463. 
On poplar. Edinboro’, Sydenham, Twycross, Terrington. 
9. Y. leucostoma, Pers., Sacc. Syll. 537 ; Hdbk. 2464. 
Appin. On Cotoneaster bacillaris. Kew. 
10. Y. Kunzei, Fries, Sacc. Syll. 538 ; Hdbk. 2465. 
On fir bark. King’s Lynn. 
11. Y. lauro-cerasi, Tul., Sacc. Syll. 546. 
On cherry laurel. Shrewsbury, Forden. 
12. Y. ceuthospora, Cooke, Sacc. Syll. 547. 
On Prunus lauro-cerasus. Forden. 
13. Y. abrupta, Cke., Sacc. Syll. 548. 
On willow. Shere. 
14. V. tessella, Fr., Sacc. Syll. 559. 
On willow. Shere. 
Sub.-Gen. 4. Euvalsa, Ntke. Disc black, ostiola not sulcate. 
Asci octosporous. 
* Microspor. 2 e. Sporidia minute, scarcely 8 p. long. 
15. Y. ceratophora, Tul., Sacc. Syll. 429 ; Hdbk. 2472. 
On oak. Weybridge, Elmstead. 
On elm. Whitehall. 
