347 
Genus XXXI. — Tichothecium, Fw. Korb., Tar., 467. 
Species 1. T. pygmaum, Kerb. 
Syn. Microthelia, Korb., Syst., 374; Mudd, 307. 
Endococcus, 1 Th. Fries., Spitsb., 51 ; Arct., 275. 
Verrucaria gemmifera, var., Leight. 
Tichothecium Rehmii, Mass. 
Sphceria lichenicola, Auctt., pr. p. 
On tballus of many saxicolous (crustaceous and sub- 
foliaceous) Lichens, e. g. : 
Placodium elegans, DC. ; albescens, Hfftn. ; cirro - 
chroum, Ach. ; fulgens, DC. 
Lecanora calcarea and var. Hoffmanni, Ach. ; calva, 
Dicks ; polytropa. 
Lecidea contigua, and var. meiosperma, Nyl. (= L. 
parasema, v. crustulata, Ach.) ; fusco-atra, Ach. ; 
sabuletorum, Schser. ; polycarpa, File. ; lapicida ; 
geographica. 
Pyrenodesmia rubiginosa, Kremph. 
Spores numerous (32 — 50), very minute, oblong-ellipsoid, 
2-locular, brown. Mudd describes it as having occasionally 
a proper thallus. Much more common than the following : 
occurring both on apothecia and thallus (Th. Fries). 
2. T. gemmiferum, Tayl. ; Korb., Par., 468. 
Syn. Verrucaria, Tayl. ; Leight. 
Endococcus, Nyl. ; Leight., Exs., 137 ; Th. 
Fries, Spitsb., 51 ; Arct., 275. 
Phceospora, Hepp, 700. 
Microthelia propinqua, Korb., Syst., 374 ; Mudd, 
307. 
Spharia lichenicola, Auctt., pr. p. 
On thallus of various saxicolous Lichens, e. g. Lecidea con- 
tigua and var. meiospora ; L. fusco-atra ; L. confluens, Ach. ; 
L. sabuletorum ; L. parasema, v. latypea, Ach. (= L. co- 
niops, Ach., pr. p.) ; also on various Lecanora, e. g. L. 
cinerea (fide Th. Fries), L. atra (fide Mudd). 
Spores 8 — 12, ellipsoid, minute, 2-locular, brown. Mudd 
describes the plant as sometimes having a proper thallus. 
3. T. erraticum, Mass. ; Korb., Par., 468. 
Syn. Endococcus, Mass.; Nyl. 
On thallus of Lecanora chalybcea, Schser., and L. auran- 
1 The disuse of this generic name among Lichens is desirable, inasmuch 
as it is also applied to a genus of Protophyla [ Palmellacece ] according to 
Naegeli. Moreover, there seems no proper ground for separating this and 
allied pseudo-genera from Verrucaria. 
