348 
tiaca, Lightf. (Korb.) ; on L. calcarea and Squamaria concolor, 
Ram. (apothecia and thallus, fide Nyb, Pyren., 64). 
Spores ellipsoid, numerous, very minute, 2-locular, brown. 
4. T. stigma, Korb., Par., 468. 
On thallus of Lecidea (Psora) lamprophora, Korb., and L. 
geographica. 
Spores 8, 2-locular, brown. 
5. T. Arnoldi, Hepp ; Korb., Par., 469. 
Syn. Abrothallus, Hepp. 
Phceospora, Hepp, 701 and 702. 
Microthelia, Hepp ; Mass. 
Lecidea talcophila, Ach. 
Buellia, Korb., Syst., 230. 
Splueria, Hepp ; Moug. 
Karschia, Korb., Par., 460. 
On thallus of Urceolaria scruposa, vars. arenaria, Schaer., 
bryophila, Ach., and iridata, Mass. 
Spores 8 — 12, very minute, soleaform (2-locular), brown. 
6. T. grossum, Korb., Par., 469. 
On thallus of Umbilicaria arctica. 
Spores 6 — 8, small, soleaform (2-locular), brown. Th. 
Fries suggests (L. Arct., 165) that this may be Dotbidea 
Lichenum, Smrf., •which is parasitic on same thallus. 
Genus XXXII. — Microthelia, Korb. Mudd, 306; 
Linds., N. Z. Lieh. and Fungi, 436. 
Species 1. M. rugulosa, Borr. 
Syn. Verrucaria, Borr. ; Leight. 
Endococcus, Nyl., Prod., 193. 
Tichothecium erraticum, Mass, (fide Nyl.). 
On thallus of Lecanora calcarea and Squamaria concolor 
(Nyl., Prod., 71 and 193). Mudd describes it as having 
proper thallus. 
Spores 8, oblong, 2-locular, dark brown (Mudd) : some- 
times numerous and ellipsoid (Nyl.). 
It is doubtful whether Mudd and Nylander here refer to 
the same plant. If they do, it is note-worthy that its thecae 
are both polyspored and 8-spored, a circumstance that would 
have great significance in relation to the specific separation 
from each other of such parasites as Tichothecium erraticum 
and T. gemmiferum. 
2. M. calcaricola, Mudd, 306. 
On thallus of Lecanora calcarea and L. gibbosa, Ach. 
Spores 8, ellipsoid-oblong, 2-locular, brown. 
