136 FIELD COLUMBIAN MUSEUM BOTANY, VOL. i. 



A. microplacum (B. & C.) Sacc. 



On Sassafras Sassafras, alt. 1,800 ft. , March 21, 1893 (Nut tall, 



9i5)- 



XYLARIA Hill. 



X. polymorpha (Pers.) Grev. 



On dead logs, April 7, 1893 (Nuttall, 890). 



X. corniformis Fr. 



On rotten limb, Sept. 9, 1893. On Magnolia Fraseri, Nov. 

 1895 (Nuttall, 1194). 



X. Hypoxylon (Linn.) Grev. 



On dead log, March 10, 1893 (Nuttall, 807). 



X. flabelliformis (Schw.) B. & C. 



On Carpinus Caroliniana^ May 13, 1893 (Nuttall, 957). 



X. Cornu-Damse (Schw.) Berk. 



On wet rotten log, alt. 2,000 ft., Aug. 24, 1893. Spores 20 to 

 21 x 4.5 fj. (Nuttall, 1179). 



USTULINA Tul. 

 U. vulgaris Tul. 



On dead and rotting stumps, March 8, 1893 (Nuttall, 954). 



HYPOXYLON Bull. 



H. atroviride E. & E., Proc. Phila. Acad., 346 (1894). 



TYPE HABITAT: On bark of dead tree, Betula or Quercus, Dec., 

 1893 (Nuttall, discov. 1320, 275). 



Stroma pulvinate, i to 1.5 cm. across, and about 4 mm. thick, 

 orbicular, covered above with a thin (.5 mm.) carbonaceous crust, 

 which is soon covered by a dark green layer of the ejected spores, 

 laterally and internally dirty-umber color. Perithecia (which 

 constitute the entire inner substance of the stroma) ovate com- 

 pressed, and including the long, stout neck, about 3 mm. long 

 and i mm. broad below. Ostiola papilliform, soon covered and 

 obscured by the ejected sporidia. Asci cylindrical 100 x 3.5 to 

 4 IJL (p. sp. 40 to 45 long), paraphysate, 8-spored. Sporidia uni- 

 seriate, oblong-elliptical, pale brown under the microscope, 

 2-nucleate, 4. 5 to 5.5 x 2 /*. 



This is a well-marked species. The substance of the stroma, 

 except the superficial carbonaceous layer, is friable, and in this 

 respect as well as the color resembles H. Petersii'Q. & C. , from 

 which, however, in other respects it is very distinct. 



H. coccineum Bull. 



On Aralia spinosa, alt. 1,300 ft. , Aug. 18, 1893 (Nuttall, 1173, 

 140). 



H. Nuttallii E. & E., Proc. Phila. Acad., 346 (1894). 



TYPE HABITAT: On bark of dead Magnolia Fraseri at Glade 

 Creek, May 1894 (Nuttall, discov. 1494, 477). 



