ii. Y. (listailS, n. sp. Differs from V. Nylcinderi, according to 
Tuck., Genera , p. 269, in its capillary paraphyses, and its smaller, 
narrower, 2-3 locular spores, .014-21 by .005-7 mm - On .shaded 
stones, head of Purchase street, 1866. Not found since. 
56 . PYRENULA, Ach., Naeg. & Hepp., Tuck. 
* Spores without color. 
1. P. piinctiforiliis, (Ach.) Naeg. On various barks. The sper- 
matia in one specimen are .007-10 mm. long; in another .011-14 
mm. long. Tuckerman has referred here a plant on white birch, 
Weymouth, in which the spores are from 4-locular, at length muri- 
form, .018-25 by -007-9 mm. 
b.fallax , Nyl. The paraphyses distinct. 
2. P. gem 111 atil, (Ach.) Naeg. On trees, the spores .011-16 by 
.005 4-8 m m. 1863. 
b. niacrocarpa , Hmpe. Kbr. Parerg ., p. 347? The apoth. 
and spores larger than in a\ the latter .025-42 by .012-19 mm - 
A specimen of a , on buttonwood, 1880, has pycnides with oblong 
stylospores, .011-13 by .003-4 mm - 
3. P. liyalospora, Nyl. On trees. Rare. 1S6S. 
4. P. leucoclllora, Miill., Bcitr ., n. 615. Thallus thin, effuse, 
soon rimulose, glaucescent. Gonidia depauperate-seriate and sub¬ 
solitary, subglobose, .008 mm. in diameter, green. Apoth. about 0.2 
mm. in diameter, dimidiate, spherical, black, shining, incurved at the 
base. Paraphyses at length lax, slender. Spores in 8s in broadly 
clavate thekes, without color, 2-locular, ovoid-ellipsoid, .012 by .006 
mm. On red cedar, 1SS5; on hornbeam, red maple, beech, and dead 
wood. 
5. P. rhyponta, (Ach.) Hepp. On branches of sassafras and 
Sinilax rotundifolia , 1881. The spores are rare, and as seen, only 
2-locular, .016-19 by .004-6 mm.; hence perhaps the same as P. rhy- 
pontella , (Nyl. in Hue, Addenda, n. 1S27.) 
** Spores colored. 
6. P. leucoplaca, (Wallr.) Kbr. On trees, N. B., 1873, an 4 Wey¬ 
mouth. Spermatia oblong, .005.4-7 mm. long. 
7. P. glabrata, (Ach.) Mass. On trees, 1867. 
8. P. stallrospora, Tuck. ms. Resembles the preceding, but the 
four sporoblasts at length once divided. Spores .01^-22 by .007-S 
mm. Spermatia needle-shaped. Only a single specimen found on 
red maple in swamp, 1867. 
