334 39. PARMELIACEAE [155. Cetraria 



OTHER SPECIES REPORTED 

 Parmelia cetrarioides Del. — Massachusetts. 

 Parmelia endoxantha Merrill — Florida. 

 Parmelia fuliginosa (Wibel) Nyl. — Washington. 

 Parmelia Halseyana Tuck. — New England. 

 Parmelia Herrei Zahlbr. — California. 

 Parmelia hypotropa var. sorediata Mull. Arg. — Texas. 

 Parmelia mesogens Nyl. — Washington. 



Parmelia olivetorum (Ach.) Nyl. — Louisiana and southern California. 

 Parmelia oncodes Tuck. — Lake Superior region. 

 Parmelia phaea Tuck. — Pennsylvania. 

 Parmelia recipienda Nyl. — Louisiana. 

 Parmelia scortea Ach. — Louisiana. 

 Parmelia subcapitata Nyl. — Southern California. 

 Parmelia xanthomela Nyl. — Florida. 



155. Cetraria Ach., Meth. Lich. 292. pi. 5, f. 3. 1803. 



Thallus foliose or fruticose, foliose forms closely adnate or more or less ascend- 

 ant, lobed, with well-developed cellular cortex above and below, the fruticose 

 forms cylindrico-compressed or more or less channeled, erect, branched; apothecia 

 small to large, round to irregular, sessile to subpedicellate, terminal or marginal, 

 the disk concave to convex, flesh-colored to brown, the exciple entire to more or 

 less irregular; hypothecium hyaline to brownish; hymenium hyaline below to more 

 commonly brownish above; paraphyses short, unbranched to branched; asci short, 

 clavate; spores 8, hyaline, non-septate, subellipsoid to subspherical. 



The algal host is Protococcus. 



A. Thallus foliose to somewhat subfruticose 



B. Thallus greenish gray to yellowish or straw-colored, rarely darker 

 C. Margins more or less sorediate or bearing spinules 

 D. Margins more or less sorediate 

 E. Soredia whitish or greenish gray 



F. Thallus middle-sized to large, margins very irregular 

 G. Lobes broad to narrow, margins sometimes 

 extending into much-branched coralloid 



branchlets 1. C.glauca 



G. Lobes narrow to linear, the margins rarely 



extending into short coralloid branchlets . . 2. C. Tuckermani 

 F. Thallus small, margins entire to crenulate ... 3. C.Oakesiana 



E. Soredia yellowish 4. C. juniperina 



D. Margins beset with spinules 3. C. Oakesiana spinulosa 



C. Margins not sorediate or spinulose 

 D. Lobes reticulately pitted 



E. Lobes broad 5. C. lacunosa 



E. Lobes narrow and elongated 7. C. stenophylla 



D. Lobes smooth to wrinkled 6. C. aurescens 



B. Thallus greenish gray to brownish or blackening 

 C. Thallus small and often scanty 



D. Lobes short, margins undulate to crenate 9. C. saepincola 



D. Lobes small, much divided, margins toothed 8. C. Fendleri 



C. Thallus middle-sized to larger, abundant 

 D. Margins not sorediate 



E. Lobes narrow and much branched 



F. On trees; thallus greenish gray to brownish, margins 



ascending, sometimes ciliate 12. C. ciliaris 



F. On rocks; thallus dusky brown to blackening, 



closely adnate 11. C. fahlunensis 



E. Lobes broad, not much branched 13. C. platyphylla 



D. Margins usually sorediate 10. C. chlorophylla 



A. Thallus subfruticose to fruticose 



B. Thallus straw-colored, yellowish or greenish to rarely brown 



C. Lobes narrow, smooth, rarely divided above 14. C. cucullata 



