288 NATURAL HISTORY BULLETIN. 



Helotium citrinum {Hedw.) Fr. 

 Plate XXI, fig. i. 



1801 Pcziza citrina Persoon, Syn. Fung., II, p. 663. 



1823 Pcziza citrina Fries, Syst. Myc. , II, p. 131. 



1860 Helotium citrinum Berkeley, Brit. Fung., p. 372. 



1871 Helotium critrinum Cooke, Handbk. , of Brit. Fung. II, p. 711. 



1881 Helotium citrinum Phillips, Brit. Disc, p. 157. 



1889 Helotium citrinum Saccardo, Sylloge Fung. , VIII, p. 224. 



1897 Helotium citrinum Engler-Prantl, Pflan. Famil. , I, p. 207, fig. 162. 



1899 Helotium citrinum Underwood, M. M. and M., p. 57. 



1900 Helotium citrinum Durand, Bull. Torrey Bot. Club, 27, p. 483. 



Cups sessile or shortly stipitate, plane, slightly concave or 

 convex, hymenium lemon yellow, often whitish outside, firm, 

 smooth, i to 8 mm. in diameter; asci cylindrical or clavate; 

 sporidia 8, fusiform or oblong elliptical, 2 to 3-guttulate, 

 often pseudo-septate, 10 by 3 microns; paraphyses filiform, 

 very slender. 



Habitat — On decaying wood in moist places; summer and 

 fall; Iowa City. 



The plants of this species are very common on wood and 

 easily recognized on account of their bright yellow color. 

 They are generally produced into a short stem below, but are 

 often sessile and more or less irregular in outline. The sub- 

 stance of the plant is firm as is shown by the fact that they do 

 not shrink much in drying. 



Genus III— C O R Y N E Tulasne. 



Plants tufted, with a short, thick stem, externally smooth 

 gelatinous, hard when dry. Hymenium at first concave be- 

 coming nearly plane, generally dark colored. Asci cylindrical, 

 8-spored; spores fusiform, at last 2 to 8-celled, generally in 2 

 rows. Paraphyses slender, enlarged upwards. Found on de- 

 caying wood. 



One species is found in woods near Iowa City. 



