114 NATURAL HISTORY BULLETIN 



the two hosts named above. They are most common on the in- 

 side of dead, loose bark of willow where they occur often in great 

 abundance. The inner bark of a dead willow in Mt. Pleasant 

 was found to be entirely covered with these plants. Specimens 

 which had fallen in a damp place showed the apothecia to be ex- 

 panded and entirely circular in form while younger specimens of 

 those in drier conditions were hysteriform with the lips more or 

 less spreading. 



In the judgment of the writer, this w r ould seem to be a typ- 

 ical representative of the genus Hysteropatella as established by 

 Rehm and for this reason I have ventured to make the combina- 

 tion. 



Specimens from the herbarium of the writer have been exam- 

 ined by Mr. Peck and the identification reported to be correct. 

 This is a fine species very distinct in the decidedly clavate pale 

 brown spores, entirely different from Patellaria clavispora Berk 

 &Br. 



BLITRYDIUM DeNotaris, Comm. Critt. It. 1 : 374. 1863. 



Apothecia fleshy-coriaceous, at first buried, becoming erum- 

 pent, opening irregularly finally becoming patelliform ; asei cla- 

 vate. 4 to 8-spored ; spores elliptical or elongated, becoming muri- 

 form, at first hyaline, becoming pale yellowish-brown. 



One species found in Iowa. 



Blitrydium penestratum (Cooke & Peck) Sacc, Syll. Fung. 

 8 : 805. 1889. 



Plate 40, f. ii. 



Patellaria fenestrata Cooke & Peck ; Peck Ann. Rep. N. Y. St, 

 Mus. 28: 68. 1879. 



Plants at first immersed springing through the outer bark 

 singly or in small groups, at first linear or triangular or more or 

 less star-shaped, lips expanding gradually becoming patellate 

 and at last entirely circular in outline ; hymenium plane with the 

 margin elevated, black, appearing rough ; asci very broad-clavate, 

 with a long stem-like base, 8-spored, 125 by 25/*; spores very 

 large, clavate, at first hyaline, then yellowish-brown about 10 to- 



