26 
naked rock from which the fragments were detached, not more than 
one-eighth inch, in at first thin, but at length thickening areoles, on 
which apothecia after a time appeared. On one of these naked 
patches a specimen of Parmelia conspersa has reached a diameter of 
over an inch ; and another is completely covered with Buellia petrcea , 
bearing apothecia. 
2. L. contigua, Fr. On stones in walls, N. B., very common; 
and in Weymouth. The spores of our plant differ considerably in 
size, in some measuring .013-16-25 by .007-9-13 mm., and in others 
.006-9-13 bv .003^-5-7 mm. (v. meiospora , Nyl.) 
b. lignicolci. On dead wood, Barnstable, 1879; and Bridge 
street, Fairhaven, 1883. Spores .013-18 by .007-10 mm. 
3. L. speirea, Nyl. On shaded rocks. Rare. Spores .016-20 
by .008-9 mm. 
4. L. albocoerillescens, (Wulf.) Schair. On rocks, mostly in low- 
woods, N. B. and Weymouth. 
5 - L. platycarpa, Ach. On rocks, N. B. and Weymouth. Rare. 
6. L. enteroleuca, Fr. On trees, rails, and stones. Not com¬ 
mon. 
c. achrista, Sommf. On poplar. 
f. flavida, Fr. On hickory, Weymouth, and on rails. 
7. L. melanclieiina, Tuck. On rails. Common. 
8. L. cyrtidia, Tuck. On fragments of rock at the foot of a 
ledge in Quincy, 1871. On stones, N. B., 1869, and Weymouth. 
Not common. • 
9- L. lieglecta, Nyl.? On rocks, sterile. See, as to this plant, 
Tuck. Syn . II, p. S4. 
10. L. acclillis, Flot. On poplar, Weymouth. 1871. Very rare. 
87. BUELLIA, I)e Not., Tuck. 
* Eubuellui. Spores 2 -plurilocular. 
1. B. stigmata, luck. On quartz, Weymouth, 1866, and New 
Bedford. Rare. Reaction of the thallus with potash, red. 
2. I>. lepnlastra, luck. On rocks, N. B. and AVeymouth. 
3. B. spuria, (Seiner.) Am. On rocks. 
4. B. strlllllata, (layl.) Br. N Rostr. On stones in wall. Peni- 
kese Island, 1873: on Cuttyhunk Island, 1882. 
