CANKER GROWTH ON ABIES BALSAMEA 27 
larch canker Dasyscypha occurs in the United States * and further 
that it is the only parasitic species in the genus Dasyscypha. Since 
the publication of Tubeuf’s ‘“ Pflanzenkrankheiten,”’ however, 
Wagner + has found that Dasyscypha calyciformis (Willd.) Rehm, 
is parasitic on Pinus silvestris, Abies pectinata and Picea excelsa, in 
Germany. These two are the only parasitic species of Dasyscypha 
that have heretofore been reported, but there can be no doubt but 
that more of the ones inhabiting the bark of living trees, will be 
found to be parasitic, when a careful examination of these is made 
That the Minnesota Dasyscypha on Abies balsamea is neither 
D. calycina nor D. calyciformis, is shown by the extreme minute- 
ness of its spores, which are smaller than those of any of the 
species which it resembles. The ascoma resembles that of D. 
Agassizii B. & C., but is much smaller. The size of the ascoma, 
as well as that of the spores, agrees most closely with those of 
D. chamaeleontina (Peck) Sacc. described by Peck{ from speci- 
mens collected at Sandlake, New York, on the under surface of 
hemlock-wood lying on the ground. Peck states that there is 
scarcely any appearance of hairiness on the cups, and that when 
the cups are bruised, they change in color from white to yellow, 
then to pink or red. The cups of the Minnesota Dasyscypha, do 
not change in color when crushed, nor are its spores “ stipitate”’ 
as in D. chamaeleontina. 
All the characters of the Minnesota Dasyscypha correspond 
most closely with those of Dasyscypha resinaria (Cook and Phil.) 
Rehm., which has been found in North Wales and in Hungary. 
It resembles this species so closely that there can be no doubt as 
to its being this one. In the following table, comparisons are 
made between the closely related species : 
Inthe original description of D. re sinaria§ the size of the 
spores was give as 5 x 2.54. This was found by Massee|| to be 
too large, as shown by the following, copied from Massee’s de- 
* Tubeuf, K. von, Diseases of Plants induced by Cryptogamic Parasites. es 
lish translation by Dr. W. G. Smith, 271. 
T Wagner, G., Beitrage zur kenntniss d. cceexecossenimeseanues Zeitschr. Pflan- 
zenkrankheiten, 6: 321. 1896. 
+ Peck, C. H., Reg. Report, 30: 60. 
@ Grevillea, 3: 185. 1875; and Phillips, British Discomycetes, 242. 
|| Massee, George, British Fungus Flora, 4: 344- 
1887. 
