DOTHJDEALES 45 



forming the gills and causing the surface to appear a bright reddish 

 orange color ; several other species of various colors are found on 

 Russula ; still another genus (Nectria) appears in the form of small 

 or minute red tubercles on dead branches or trunks. In all, the 

 single family Hypocreaceae* contains some sixty genera and over 

 800 species, one fourth perhaps of which are from the United 

 States. 



LITERATURE. 



Saccardo. Sylloge Fungorum, 2 : 447-587 ; 9 : 941- 1004 ; n : 

 354-368. 



Lindau. Die natiirlichen Pflanzenfamilien, i 1 : 343-372. 



Tulasne. Selecta Fungorum Carpologia, 3 : 1865. 



Tulasne. Memoire sur 1' ergot des Glumacees. Ann. Sc. Nat. 

 III. 20: 1-56. PL 1-4. 1853. 



Massee. A Revision of the Genus Cordyceps. Ann. Bot. 9: 

 1-44. PL 1-2. 1895. 



Ellis & Everhart. Synopsis of the North American Hypocre- 

 aceae. Jour. Mycol. 2: 28-31, 49-51, 61-69, 73-80, 97-99, 109- 

 iii, 121-125, 133-137. 1886; 3: 1-6. 1887. 



Additions to Hypocreaceae. Jour. Myc. 3 : 113-116. 



1887. 



The North American Pyrenomycetes, 58-122. 1892. 



Order 7. DOTHIDEALES. 



This order, consisting of a single family Dothideaceae with some 

 25 genera and 400 species, is made up of species growing mostly 

 on dead or dying plant tissues, the perithecia being buried in a 

 black or blackish stroma, the wall of the perithecium being in- 

 distinct and fused with the stromatic substance. Nearly half the 

 species belong to the genus Phyllachora, very common on the 

 leaves of grasses and other plants and forming lines and patches 

 superficially placed like those of the black rusts. While most of 

 the species are saprophytic, a few are genuine parasites ; among 

 the most notorious is the black knot of the plum and cherry 

 which well represents the stromatic condition. This fungus ap- 



* Some mycologists regard this order as made up of several well- 

 marked families. Lindau, loc, cit , arranges the genera in six tribes; some 

 are disposed to regard these as families. 



