2/S NATURAL HISTORY BULLETIN. 



32 in each ascus, large, attenuate at the ends, often filled with 

 large guttulae, or granular, 23 to 24 by 35 to 38; paraphyses 

 slender, branched. 



Habitat — Grown on cow dung in the laboratory, Iowa City. 



The plants of this species have been grown several times 

 under glass in the laboratory. They are at first white or 

 nearly so, and taper to a point at the top which gradually 

 spreads until the plant becomes cylindrical with the hyme- 

 nium convex. When mature the whole plant is from 2 to 

 3 mm. in diameter and about the same in height. The spores 

 are often surrounded by a hyaline gelatinous substance. 



Ryparobius sexdecimsporus (Cr.) Sacc. 

 Plate XVIII, fig. 1. 



1871 Ascobolus se.rrfcciiusporus Cooke, Hanbk. of Brit. Fung., II, p. 730. 

 L887 Ascophanus sexdecimsporus Phillips, Brit. Disc, p. 311. 



Ryparobius sexdecimsporus Saccardo, Sylloge Fung. , VIII, p. 5-11. 

 1897 Ryparobius st\vJccim$porus'En«\&r-Vra.\\\\, Pflan Famil. , I, i, p. 190. 



Scattered, very minute, sessile, yellowish white, just visible 

 to the naked eye, hymenium papillate with the emergent 

 asci; asci broad, curved or straight, 75 to 80 by 16 to 18 

 microns, terminated by a short, curved stem below; sporidia 

 16 in each ascus, elliptical, guttulate, smooth, 10 to 12 by 6 

 microns; paraphyses numerous, filiform, simple or branched. 



Habitat — Grown on old cow dung in the laboratory, winter, 

 Iowa City. 



These plants resemble in external appearance and size the 

 plants of Ryparobius crustaccus but are distinguished by the 

 number of spores in each ascus which is 16. The asci in this 

 case are not quite as broad as in the other, as would naturally 

 follow from the smaller number of spores contained. The 

 plants were found scattered but in considerable numbers. 



Ryparobius pachyascus Rchm. 

 Plate XVIII, fig. 11. 



L889 Ryparobius pachyascus Saccardo, Sylloge Fung. . VIII, p. 541. 



