NOTICES OF NORTH AMERICAN FUNGI, 159 



* Exysiphe communis. Lli. — Canada, Poe. No. 6147, 6150, 

 6156. On apple leaves. No. 6148. On Cratcegus. Alabama, 

 Peters. No. 4540. On Galium. Monntains of Virginia. No. 

 3334. On Ranunculus acris. Massachusetts. No. 2390. On 

 Senecio hieraciifoUa. Pennsylvania, Michener. No. 3522. On 

 Clematis Virginica. No. 3528. On Senecio auriculata. Car. Inf. 

 No. 3400. On Scutellaria lateriflora. Pennsylvania, Michener. No. 

 3550. On Vtrbena nrticifolia. No, 3289. 



989. Erysiphe spadicea. B. 8f C. — Peritheciis spadiceis, appendi- 

 cibus flexiiosis ; sporidiis quaternis. 



On leaves of Xanthiurn. Car, Inf. No. 2984. 

 Perithecia scattered, rich brown, appendages flexuous, three times 

 longer than their diameter ; sporidia four. 



990. Ezysiphe polychseta. B. cfc C. — Maculis orbicularibus ; ap- 

 pendicibus brevibus plurimus rectis ; ascis elongatis clavatis. 



On leaves of Celtis. Alabama, Peters. No. 3876. 



Spots orbicular, yellow-brown in the centre from the young 

 perithecia ; appendages about equal to their diameter, straight ; 

 asci elongated, clavate. 



* Exysiphe hoxxidula. Lev. — On leaves of Xanthiurn. Pennsyl- 

 vania, Michener. No. 3471. Car. Inf. No. 3231. 



* Exysiphe Fhlogis. Schn-ein. — Massachusetts, No, 3684. 



* Exysiphe Chelones. Schrvein. — Pennsylvania, Michener. No. 

 3498. 



991. Exysiphe fuscata. B. ^- C. — Tota fusca ; appendicibus quan- 

 doque furcatis ; sporidiis octonis. 



On leaves of Bidens frondosa. Pennsylvania, Michener. No. 

 3526. 



Perithecia bright brown , appendages dark, sometimes forked at 

 the apex ; sporidia eight. 



* Uncinula adunca. Lev. — On Popidus. Canada, Poe. No. 

 6152, 6166. On yEsculus Pavia. Car. Inf. No. 4035. On elm. 

 Alabama, Peters. No. 4597. 



992. Uncinula spixalis. B. Sc C. — Appendicibus longis flexuosis 

 apice spiralibus. 



On leaves of Vitis Lahrusca. Pennsylvania, Michener. No. 

 3610. 



Forming thin white patches, in which the younger perithecia are 

 pale, the older dark brown ; appendages long, flexuous, with two 

 spiral turns at the apex ; sporidia about six, rather narrow, 

 elliptic. 



993. Uncinula polychaeta. B. ^ C. — Peritheciis sparsis ; appen- 

 dicibus multis. 



On leaves of Celtis occidentalis. Car. No. 5619. 

 Perithecia scattered ; appendages about 28, 1^ longer than the 

 diameter of the perithecia, hyaline. 



