621 



obovate or pyriform, 50-80 [x in the longer diameter and about 40 p 

 in the shorter, 8-spored, without paraphyses. Sporidia ovate-oblong, 

 hyaline, 5-7-septate, with one or more partial longitudinal septa, 

 rounded and obtuse at the ends, 20-30x12-15 //, mostly a little con- 

 stricted at the middle septum and slightly curved. 



On trunks and branches of Jiving trees, Carolina (Curtis & Rav- 

 enel), Alabama (Beaumont), Massachusetts (Sprague), Pennsylvania 

 (Michener), Michigan (Hicks), New Jersey (Ellis); on limbs of living 

 orange trees, Florida (Hopkins). 



The measurements of asci and sporidia are from the Florida 

 specimens; those from more northern localities have the sporidia 

 mostly smaller. The Florida specc. (M. Yunnanensis) also differ 

 from those found in the northern States, in the absence of any i'n><>- 

 margined, thalloid, effigurate subiculum. The genus Myriangium 

 (from which Phymatosphceria can not well be separated) has been 

 classed among the Lichens, but the absence of spermogones and goni- 

 mous cells, seems to exclude it from that order. Its true place in the 

 mycological system is also doubtful, but its affinity seems to us with 

 the Dothideacece. Eurytheca, De Seynes, is closely allied. We have 

 seen no specc. of Phymatosphceria Abyssinica and P. Brasiliens/s. 

 which are given above as probable synonyms. 



FAMILY. XYLARIEiE. 



Stromata very variable in form and size, mostly free, but often 

 more or less sunk in the matrix; either upright and often branched or 

 horizontal, effused, crustaceous, pulvinate, globose or hemispherical, 

 mostly black or becoming black, of woody, carbonaceous or suberose- 

 carnose consistence. Perithecia peripherical, concentrically arranged. 

 Asci cylindrical, 8-spored. Sporidia continuous, brown or black, 

 often inequilateral; young stroma clothed with a conidial layer, 



NUMMULARIA, Till. 



Sel. Carp. II, p. 42. 



Stroma orbicular, cup-shaped or discoid, becoming black, mar- 

 ginate, the margin more or less distinctly sterile. Perithecia mono* 

 tichous, peripherical, immersed. Asci cylindrical, 8-spored. Sporidia 

 uniseriate, subelliptical, continuous, dark. The genus is too el- 

 allied to Hypoxylon, especially the discoid forms. 



