l.ICIIENS Ol' SANTA CRUZ PENINSULA 379 



Determination by Dr. Hasse ; through an oversight not sub- 

 mitted to Dr. Zahlbruckner. 

 Collcma cristatcUum Tuck. Lich. Cahf. 29. 1866; Tuck, Syn. 



N. Am. Lich. i : 152. 1882. 



XVI. Leptogium Gray. 



Thallus foliaceous or rarely fruticulose, with a distinct cortical 

 layer; lead-colored, brown, dark green, or black. Apothecia 

 scattered or crowded, usually numerous, small ; spores bilocu- 

 lar, to plurilocular or muriform-multilocular, ovoid or ellipsoid, 

 colorless. 



Our species not well known as yet; only those which have 

 been positively identified are herein described, although at least 

 two or three more species are represented in our flora. 

 Lcftogiiim Gray, Nat. Arr. i : 395. 182 1. 



KEV TO THE SPECIES. 



a. On earth, moss or rocks. 



b. More or less white fleecy beneath, margin minutely white ciliate. 



I. albociliatiiin^ 380. 

 bb. Without nap or fibrils beneath. 



c. Thallus very small, rather entire 2. scotimim^ 3S0. 



cc. Thallus medium size to large. 



d. Color red-brown, chestnut or plumbeous ; lobes narrowed, 



corniculate tipped 5. pahiiatti?>i, 381. 



dd. Color bhick. 



e. Erectisli, crenate, narrowed, complicate. 



3 . ca lifo rn icii m, 381. 

 ee. Flat, expanded, suborbiculate. 



4. calif 01- niciim platyniifn^ 381. 

 aa. On trees. 

 f. Dark green to black ; usually smooth beneath ; thallus fenestrate 

 wrinkled, with isiodose granulate or isidiose lobulate ridges. 



6. chloro}neliini stellaiis^ 382. 

 ff. Lead-color to blackish green. 



g. Beneath fleecy, with long white or brown fibrils. 



7. Saturn inum^ 3S2. 

 gg. Beneath covered with minute velvety pubescence. 



8. luyochrotun to7)ientosti77i^ 3S3. 



