290 BOTANICAL GAZETTE [APRIL 
determined material for comparison. Spores in my specimens 
measure eae bh. 
14. RHIZOCARPON MONTAGNE! (Flot.) Koerber. 
15. BIATORELLA REVERTENS (Tuck.) Herre. 
16. ACAROSPORA RUFESCENS (Sm.) Th. Fr. 
17. ACAROSPORA CERVINA (Pers.) Koerber. 
18. ACAROSPORA SQUAMULOSA (Schrad.) Th. Fr.—Spores of 
Reno material are aoe bh. This is too small for squamulosa, 
but I cannot place our plant elsewhere. 
19. ACAROSPORA THAMNINA (Tuck.) Herre.—This is a peltate 
plant which I place here with doubt, having no material for com- 
parison, but it agrees fairly well with the description. 
20. ACAROSPORA peELTAsTICA A. Zahlbr.—Occurring in small 
patches amid other lichens, and rather common on the rocky 
débris of the desert. Hitherto known only from the deserts of 
southeastern California. 
21. ACAROSPORA BELLA (Nyl.) Herre. 
. ACAROSPORA CHLOROPHANA (Wahlb.) Mass. 
23. GYROPHORA RETICULATA (Schaer.) Th. Fr. 
24. GYROPHORA HYPERBOREA (Hoffm.) Ach. 
25. GYROPHORA PHAEA (Tuck.) Herre. 
26. GYROPHORA EROSA (Web.) Ach.—Usually dwarfed and non- 
typical. 
27. THYREA PULVINATA (Schaer.) Mass.—In small holes oF 
crevices on the south and southeast face of a rhyolite cliff. : 
28. Peccanta ARIzonica (Tuck.) Herre. Omphalaria arizonied 
Tuck. in litt. (1884 ?).—Thallus indeterminate, dull, black, minutely 
fruticulose, forming sub-crustaceous pulvinate nodules, which . 
the naked eye appear to be composed of almost microscopl¢ unl 
form granules; branches numerous, irregular, more or less knobbed, 
their tips often enlarged and broken up into several blunt pats 
Apothecia not known to me. ‘Spores 8, sub-globose, 0-75 
A few scanty specimens were found growing on the minute 
quantities of earth which collects in small shallow holes on the south 
a face of rhyolite cliff 2 miles north of Reno. 
NS 
No 
