10 BULLETIN 380, U. $. DEPARTMENT OF AGRICULTURE. 
Fagus, as this is the first-mentioned host in the original description. 
No specimen of this species on Fagus from Schweinitz was found in 
Kunze’s collection. However, authentic specimens from Schweinitz 
on Fagus have been found in Fries’s herbarium at Upsala, in 
Hooker’s herbarium at Kew, and in Brongniart’s herbarium in the 
Paris Museum. The last, which is the largest and best specimen, 
is shown in Plate IT, figure 2. Microscopic studies of the specimens 
at Paris and Kew show only pycnidia with pycnospores. The writers 
were unable to examine microscopically the specimen in Fries’s herba- 
rium, but it agreed in all macroscopic respects and also, so far as 
could be determined with a hand lens, with the Paris and Kew speci- 
mens. These specimens agree with all the material collected on Fagus 
from various localities in the South. Studies of numerous collec- 
tions of Z’. gyrosa have shown that the pycnidial form can be dis- 
tinguished with certainty from any of the other species of Endothia 
at present known. The connection between this pycnidial form and 
the perithecial form as described has been demonstrated by pure 
cultures from ascospores and also by the association of. typical 
pycnidia and pycnospores with perithecia and ascospores in the 
same stroma. There appears to be no reasonable doubt, therefore, 
that the specimens collected by Schweinitz on Fagus were the 
pycnidial form of Endothia gyrosa, and the specimen in the Paris 
Museum which was sent by Schweinitz to Brongniart about 1825 
may properly be considered a cotype of Schweinitz’s species. The 
specimen from Schweinitz in Kunze’s herbarium at Leipzig also 
proves on microscopic examination to be the pycnidial form of the 
same fungus. It is probable from the evidence at hand that 
Schweinitz did not collect any specimen showing ascospores of this 
fungus. However, the specimen in Kunze’s herbarium shows some 
perithecia evidently immature and without spores. A part of the 
specimen from Schweinitz in Fries’s herbarium shows stromata on a 
piece of bark, evidently not Fagus, but probably Quercus. This 
also appears to be pycnidia only. 
The specimen referred to by Clinton (18), which was found in 
the original packet of Schweinitz at Philadelphia with Sphaeria 
enteromela, is also undoubtedly the pycnidial form of EF. gyrosa, 
which closely resembles some early stages in the development of 
species of Hypoxylon, especially H. enteromela. ‘These species 
may be easily confused with each other, and this would seem to be a 
probable explanation of the accidental presence of this specimen in 
this packet. Another point of interest in this connection is the fact 
that in spite of diligent search on the part of the writers and many 
other collectors and an examination of numerous specimens of En- 
dothia on Fagus in all stages of development and from different 
localities only Endothia gyrosa has been found on this host. Of 
