82 
Mr Greville on the Genus Erineum. 
accustomed to similar objects. It appears at first in the form of 
a faint blush, or slight change of colour, on the under surface of 
the leaf; this grows gradually darker till it has become of a pale 
reddish obscure purple, and of a minute sericeous or velvety as- 
pect. It forms large oval or irregular patches, and is most easi- 
ly detected by the leaf being more or less swollen or distorted. 
The tubes are very small, even under a high power, simple, 
and roundly clavate. It is a rare species, and occurs in spring 
and summer in the woods at Roslin, and similar situations. 
I have to regret that one described species is wanting to com- 
plete this short monograph, but from its excessive rarity, I have 
not been able to procure a specimen. It is Erineum pyrinumy 
Pers. Disp. Fung. p. 43. t. 4. f. 2. 
E. ohlongum laxum spadiceum is the only character given in 
his Synopsis. 
Albertini and Schweiniz add to the above distinction. Pla- 
num nec congestuin Jila laxa congesta ; and conclude with Ra- 
rissimum item unica solum vice inventum in pomario domestico 
ad foVia Pyri Maliy exeunte Junio, 
Edinburgh, Nov, 15. 1821. 
Explanation of the Plates, 
Plate II. Fig, 1. Erineum acerinumj natural size. 
2. Tubes of E. tortuosum, very highly magnified. 
• S, Do. of E. vitiSf do. do. 
4. Do. of E. subulatum, do. do. 
5. Do. of E. ilicmum, do. do. 
6. Do. of E. acerinum, do. do. 
7. Do. of E. alneumj do. do. 
8. Do. of E. clandestinum) do. do. 
Plate III. Fig. 1. Tubes of E. hetulce, veYy highly magnified. 
2. Do. oi E, fagmeum, do. do. 
3. Do. of E. tiliaceum, do. do. 
4. Do. of E. populinum, do. do. 
5. Do. of E. curtum, do. do. 
6. Do. o^E, agaricformej do, do. 
7. Do. of E. aureum, do. do. 
8. Do. of E. betulinum, do. do. 
9. Do. o?E,mmuiissmiim 3 do, do. 
