400 BRITISH DISCOMYCETES. 
B. The mycelium spreading only between the 
epidermal cells and the cuticle of the 
young shoots. : 
(a) Asci furnished with a stem-cell .. species 5-7 
0. Species the position of which is at present 
uncertain .. ei em re » 89 
Key To THE SPECIES. 
On trees ds a ao oC fe Sree 
On herbaceous plants. . we ae oe o 2 bts, 
On leaves of Alnus glutinosus: sporidia 8 .. .. Tosquinetit. 
On female catkins of Alnus glutinosus: sporidia 
more than 8 .. a oe a ie -- Alni, 
On leaves of Juglans regia .. 33 ae .. JSuglandia. 
On branches and leaves of Betula alba... .. turgidus. 
On leaves of Pyrus communis, Cratzgus Oxycantha, 
1 4 
and C. monogynea .. oc a ee .. bullatus. 
On young fruit of Prunus domestica, P. Padus, and ; 
P. spinosa .. 3 a at a .. Pruni. 
On leaves and branches of Prunus avium, P. 
Cerasus, P. domestica, P. Chamecerasus, and 
| Persica vulgaris, P. amygdalus, and P. communis deformans. 
g, {On Potentilla Tormentilla .. oe te .. Potentillz. 
* (On Trientalis Europea oe oe oe -» Trientaltis. 
A. PERENNIAL MYCELIUM SPREADING THROUGH THE IN- 
TERCELLULAR SPACES OF THE YOUNG SHOOTS OF THE 
INFECTED PLANT IN SPRING. 
(a) Asct furnished with a stem-cell. 
1. Ascomyces Prunt. (Tul.) 
On unripe fruit of Prunus domestica, spinosa, and 
Padus, deforming them ; asci oblong-clavate, rounded or 
truncate at the summit; sporidia 8, broadly elliptic, 
about 6 x 4u. 
Laphrina Prunmi—Tul. in “Ann. Se. Nat.,” ser. 5, 
vol. v. p. 129; Johanson, “Vet. Ac. Handl.,” arg. 42, 
p. 82. Hxoascus Pruni—Fckl., “Symb. Myco.,” p. 252; 
Sadebeck in Rabh., “ Krypt. Flo.,” p. 5, fig. 3. Ascomyces 
Prum—B. and Br., “ Ann. Nat. Hist.,” No. 1629; “Gre- 
villea,” v. p. 62. 
Exs.—FcklL, “F. Rh.,” 1081; Kunze, “Fung. Sel.,” 
167; Rabh., “Fung. Eur.” 1167; Rehm, “ Asco.,” 130; 
Thum., “ Fung. Aus.,” 504; Thum., “ Mycoth. Univ.,” 976. 
