Durand: Studies in North American Discomycetes 355 



turn of septate, sparingly branched threads, 2 /x thick. Asci 

 narrowly and evenly clavate, apex rounded, not blue with iodine, 

 variable in size in the same individual, 120-200 x 10-12 fi. 

 Sporidia 8, fascicled or multiseriate in the ascus, filiform-cylindri- 

 cal, or very narrowly clavate-cylindrical, ends rounded, or some- 

 times acute at one end, straight, curved, or slightly sigmoid, hya- 

 line, multinucleate, becoming 14-20-septate into cells about as 

 long as wide, very variable in size, 30-75 x 3-4 fi< Paraphyses 

 filiform, slender, longer than the asci, globose at the tips which 

 cohere, and with amorphous matter form the epithecium. 



Conidial form. — Gregarious or single, fleshy-gelatinous, stem 

 cylindrical or tapering upward, 3-10 x 2 mm., black. Head 

 broadly elliptical, soft, viscid, pallid, 2-6 x 2-4 mm. Conidio- 

 phores very slender, branched. Conidia hyaline, elliptical, 3 x 1 ft* 



On prostrate rotten logs, usually in crevices and depressions 

 in the bark, also on the bare wood, oftenest on Tilia, but also on 

 Acer% Qiiercus and Magnolia. October and November. 



Vermont (Burt) ! ; New York (Peck !, Clinton, Durand !) ; 

 Ohio (Kellerman) ! ; W. Virginia (Nuttall) ; Iowa (Holway) ! ; 

 Canada (Macoun, Dearness !). 



Explanation of Mate 



Figures 2, 4, 5, 6, 7 and 8 were drawn to the same scale. Figures I -4 are from 



specimens collected at Ithaca, October, 1900. 



1. Longitudinal section of whole ascoma to show form and tomentose stem. 



2. A portion of the tomentum, showing connection of the threads with the hyphae 

 of the stem. 



3- A longitudinal section of the cup a short distance from the margin. 



4- Asci, paraphysis and sporidia. 



5- Ascus and three sporidia of Chloroplenium Canadense E. & E., from speci- 

 mens collected at London, Canada, by Professor Dearness (no. 2032 B). 



6. Asci, paraphysis and sporidia of Lecanidion leptospermum (Pk.) Sacc. , from 

 specimens collected by Dr. Peck, at Copake, N. Y. 



7- Ascus, paraphysis and sporidia of Holwaya tiliacea E. & E., from specimens 

 collected at Middlebury, Vt., by Professor Burt. 



8. Ascus, paraphysis and sporidia of Holwaya opkioboJus (Ell.) Sacc, from speci- 

 mens in Ellis's N. A. F., no. 996. 



Botanical Laboratory, Cornell University. 



