THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 109 



ability and authority on Cladonias, but in several cases they have 

 been unable to agree or even to express a decided opinion. If the 

 following arrangement arouses someone to re-study our Californian 

 Cladonias and define our species clearly I shall feel amply repaid for 

 this entire work. 



KEY TO THE SPECIES. 



A . Apothecia scarlet. 



B. Podetia yellow with KOH; without cups i. macilenta 



BB. Podetia not yellow with KOH and bearing small cups 



2. flabelliformis 

 A A. Apothecia brown. 



C. Podetia irregularly much branched. 



D. Not cup-bearing, surface smooth or with small leafy squamules 



3. furcata 



DD. Small cups more or less present. 

 E. Surface densely clothed with leafy squamules; KOH 



4. squamosa 

 EE. Squamules few or cortex merely rough warty or ridged; cups 



more or less proliferate; KOH + 5. subsquamosa 



CC. Podetia simple or nearly so, cup-bearing. 

 F. Cups proliferous. 



G. From the centre; not perforated 6. verticillata 



GG. From the margin; cups perforated 7. crisp ata 



FF. Cups not proliferous. 



H. Podetia turbinate with top-shaped cups, naked or sorediose 



8. pyxidata 



HE. Podetia cylindrical, trumpet or club-shaped, sorediose; 

 cups reduced, often obsolete 9. fimbriata 



i. CLADONIA MACILENTA Hoffm. 



Cladonia macilenta Hoffmann, Deutsch. Fl. 2: 126. 1796. 

 Cladonia macilenta Wainio, Rev. Lich. Hoffm. 17. 1886. 

 Cladonia macilenta Wainio, Monog. Clad. Univ. 1: 98. 1887. 

 Cladonia macilenta Tuck. Syn. N. Am. Lich. I: 253. 1882, in part. 

 Cladonia macilenta Herre, Proc. Wash. Acad. Sci. 7: 391. 1903, in 

 part. 



Primary thallus scanty, minute to small, squamulose or leafy, cre- 

 nate or laciniate lobate; pale gray-green to brownish; beneath white. 



Podetia rising from the surface of the squamules, short or of medium 

 length, rarely long, cylindrical, slender, or club-like and somewhat 

 swollen, simple or with few and irregular branches, without cups; 

 covered by a dense, pale, gray-green sorediose powder which may 

 become granulose; without squamules or the granules becoming squa- 



