9- 1 *. Ilitida, Ach. On trees, especially beech, common, now- 
predominated by the dark hypothallus. 
10. P. aspistea, Nyl. Apoth. and spores smaller than in the 
preceding; the latter .016-19 by .007-11 mm. On alder, Russell’s 
Mills, 1878. Very rare. Exsic ., Lojka, n. 24S. 
11. P. thelena, (Ach.) On oak and hemlock spruce; the oblong, 
2-locular spores .019-36 by .ooS-i2 mm. A plant on hickory and 
witch hazel has smaller, ellipsoid spores .013-19 by .006-9 m m • 1 
which may perhaps be P. cinerella, (Flot.) 
12. P. oblongata, (Mull.) Beitr., n. 8S7. Thallus very thin, 
'white. Apoth. oblong, about 0.6-0.8 mm. long, depressed, dilated at 
the base. Perithecium dimidiate. Paraphyses conglutinate. Spores 
ellipsoid, brown, 2-locular, .014-18 by .007-8 mm. On white birch. 
1868. 
13. P. Willeyana, (Mull.) Beitr., n. 886. Thallus indistinct, 
pale brown, intersected and bordered by dark lines. Apoth. one-halt 
mm. in diameter, depressed-hemispherical, dilated at the base, and 
surrounded by a dark areole. Perithecium dimidiate. Paraphyses 
lax, slender. Spores 4 to 8, at length brown, 2-locular, the upper cell 
larger, .022-24 by .008-9 mm. On ash, rare, at least in fertile condi¬ 
tion. The same has been sent from Illinois bv Mr. J. Wolf. 
14. P. lactea, (Mass.) On trees, N. B. and Weymouth. Sper- 
matia staff-shaped, .007-9 mm. long. 1866. 
15. P. fall aciosa, Stizenb. On trees. Spermatia staff-shaped, 
.007 mm. long. A plant on dead branches of white pine, with 4- 
locular spores, now thrice constricted, .014-21 by .005.4-1 x mm., is 
perhaps an immature state of this. 
*** Parasitic. 
16. P. gemmifera, (Tayl.) On Placodium cerinum and Buellia 
petrcea, lignicola , 1879. Very rare. Spores in 8s, bilocular, brown, 
.007-11 by .0034-54 mm. 
17. P. endococcoidea, (Nyl. in Hue, Addenda , n. 1S06) ; Leight., 
Great Britain , p. 461. Spores oblong, 4-locular, without color, 
.014-18 by .0054-7 mm. On Buellia petrcea , 1875. 
I have also met with parasites on Peltigera canina , Lecanora 
cinerea , and Stereocaulon pnsc/iale, with bilocular spores resembling 
those of P. fund/'form is. But they are exceedingly scanty, and per¬ 
haps all these parasites should be excluded from Lichens. 
