COLLEMACEAE. 



539 



2. Dirina cerat6nlae (Ach.) DeNot. Giorn. Bot. Ital. 2: 188. 1846. 



Lecanora ceratoniae Ach. Lich. Univ. 361. 1810. 



On bark of Jacqidnia keyensls (apparently confined to this, so far as It occurs 

 In the Bahamas), New Providence, road south of Fox Hill, Eleuthera Island, at 

 Miller's Point ; Little San Salvador : Stoclilng Island, Great Exuma ; Watling'a 

 Island, on island in lake : — southern Europe and northern Africa. 



Order 4. LEOIDEALES. 



A. Spores with uniformly thickened wall, colorless 



Leptotrema and there brown and muriform. 



1. Thallua gelatinous when moist. 



Gonidia : Oloeocapsa. 

 Gonidia : 2fostoc. 



2. Thallus not gelatinous when moist. 



a. Thallus appearing as a mat of Trentepohlia 

 filaments, the hyphae to be seen only under 

 the microscope. 

 6. Thallus not as above. 



* Thallus crustose or squamulose. 

 t Thallus crustose. 



Thalline exciple absent or soon dis- 

 appearing. 

 Margin of apothecia pilose. 

 Margin of apothecia naked. 

 Gonidia : Trentepohlia. 



Apothecia with a black 



exciple. 

 Dxciple not black. 

 Gonidia : Cystococcus. 

 Thalline exciple present. 



Apothecia immersed in the thal- 

 lus or in thalline verrucae. 

 Apothecia superficial and discoid. 

 tt Thallus squamulose, or developing 

 erect fruticose podetia and the 

 original squamules disappearing. 

 Apothecia sessile on the sauamules. 

 Apothecia on the tips of erect po- 

 detia. 

 *• Thallus foliose or fruticose. 

 Thallus foliose. 



Gonidia : Blue-green. 

 Gonidia : Green. 

 Thallus fruticose, growing on trees. 

 ( Species of Cladonia might be sought 

 here, but never grow on trees.) 



B. Spores with irregularly thickened wall (i. e., polar- 



bilocular) or uniformly thickened, but then 

 always brown ; never muriform. 

 Spores colorless. 

 Spores brown. 



Thallus crustose. 

 Thallus foliose. 



In all Bahama genera except 



Fami. 1. Pteenopsidaceab. 

 Fam. 2. Collemaceab. 



Fam. 3. Cobnogoniacea& 



Fam. 4. Pilocakpacbab. 



Fam. 5. Lbcanactidaceae. 

 Fam. 6. Gtalectacbab. 

 Fam. 7. Lecideaceab. 



Fam. 8. Theeothemaceae. 

 Fam. 9. Lecanoeaceae. 



Fam. 10. Phtllopsoeaceae. 

 Fam. 11. Cladoniacbae. 



Fam. 12. Pannaeiaceab. 

 Fam. 13. Paembliaceae. 

 Fam-, 14. Usneaceab. 



Fam. 15. Caloplacaceab. 



Fam. 16. BUBiLLIACBAE. 



Fam. 17. Phtsciaceae. 



Family 1. PYRENOPSIDACEAE. 



1. PSOEOTICHIA Mass. 



1. Psorotichia Boergesfenii Wainio, Ann. Acad. Sci. Ifenn. A: 6' 

 On limestone, New Providence : — St. Thomas. 



118. 1915. 



Family 2. COLLEMACEAE. 



Spores simple. 



Spores plurilocular or muriform-multilocular. 



Thallus without a cortex. 



Thallus corticate, at least above. 



1. Phyatna. 



2. CoUema. 



3. Leptoglum. 



