58 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO SPECIES. 
Podetia not cup bearing. 
Dichotomously branching....................... 1. €. furcata racemosa. 
Corymbosely branching..................---.--. 2. C. furcata corymbosa. 
Podetia cup bearing. 
Cups well developed. 
Cortex of cups and podetia verruculose. 
Cups more or less proliferous............ 7. C. verticillata subcervicornis. 
Cups not or slightly proliferous. 
Primary thallus large............... 4. C. pyxidata pocillum, 
Primary thallus not large......... 3. C. pyxidata. 
Cortex of cups and podetia not verruculose, 
Granulose, pale sulphur-colored......... 5. C. pyxidata chlorophaea. 
Furfuraceous, grayish white............. ll. C. pityrea. 
Cups not well developed. 
Contracted; cortex finely pulverulent...... 8. C. fimbriata simplex. 
Abortive or absent. 
Podetia present, considerably developed. 
Podetia long, subulate............. 9. C. fimbriata subulata, 
Podetia not subulate, clavate above. 10. C. fimbriata clavata. 
Podetia short or none; apothecia sessile. 6. C. caespiticia. 
1. Cladonia furcata racemosa Floerke. 
Primary thallus sparingly present, persistent, the squamules oblong, crenate, 
lobulate, light green above, white beneath; podetia moderately elongate, white 
above, ash or pinkish ash below, sparingly branched, branches erect or suberect, 
bifurcate below the tips, beset with crenulate squamules of the same color as the 
primary thallus, not pervious in the axils, KHO—, Ca (C1O),—. 
On earth at San Diego. 
2. Cladonia furcata corymbosa (Ach.) Nyl. 
Primary thallus evanescent; podetia 25 to 60 mm. high, white throughout, dicho- 
tomously divided above, the branchlets redivided and bearing small, globose, light 
brown apothecia at the ends of the corymbosely arranged terminations, the stem 
sparingly squamulose, beset with small to minute, entirely white squamules or the 
larger green above, with KHO pale yellow (only the squamules); hymenial gelatine 
with iodine blue soon turning yellow, the hypothecium, however, retaining the blue 
stain. 
On earth near San Francisco, Gray; the same from Washington, Foster, very luxu- 
riant, 1 cm. high, more sparingly squamulose, KHO—, Ca(ClO),—; spores fusiform- 
ellipsoid, often slightly curved, 10 to 15 » long, 3 to4 » thick; also the same from Santa 
Catalina Island. 
3. Cladonia pyxidata (L.) Hoffm. 
Primary thallus of small squamules, dull grayish green above, white beneath, 
crowded; podetia short, verruculose throughout; cups large, entire or proliferous 
marginally, the proliferations generally with brown globular apothecia. 
Common in our territory and cosmopolitan. 
4. Cladonia pyxidata pocillum (Ach.) Flot. 
Primary squamules larger than in the species, of more somber color, appressed; 
podetia short. 
On earth; near San Diego, Alderson (communicated by Parish), Rare with us. 
5. Cladonia pyxidata chlorophaea (Spreng.) Floerke. 
Primary squamules less spreading than in the species, whitish or pale sulphur-col- 
ored, granulate-pulverulent; cups regular, rarely proliferous. 
