130 HERRE 



4.9 - 8.5 



finally dusky or blackish, 



7.3 - 12.25 



Rare; forming black stains on limestone at the summit of Black 

 Mountain, altitude 2787 feet. 



XXIX. Ephebe Fries. 

 Ephebe E. Fries. Syst. Orb. Veg. 256. 1825. 



Thallus f ruticulose, branched, composed mainly of the alga Sirosi- 

 phon pulvinatus associated with a fungus, the form and habit of the 

 plant being due mainly to the alga; color black; apothecia immersed 

 or superficial and globose; spores ellipsoid and colorless. On rocks. 

 Species few and doubtful. 



i. EPHEBE SOLID A Born. 



Ephebe solida Bornet, Ann. Sci. 3: 171. 1852. 



Ephebe solida Tuck. Syn. N. Am. Lich. I: 132. 1882. 



Ephebe pubescens Herre, Proc. Wash. Acad. Sci. 7: 375. 1906. 



Thallus small, erect, tufted, stout, minutely shrub-like, compact, 

 much branched; sooty black; always sterile with us. 



Abundant on perpendicular sandstone rocks at several different 

 places in the ridge between Searsville and Stanford University, at an 

 altitude of about 400 feet. Apparently not occurring elsewhere in 

 the peninsula. 



A very remarkable form unlike any other lichen of our flora. For- 

 merly described by me as Ephebe pubescens, but differing from that 

 plant in its much shorter, stouter, and more shrub-like filaments and 

 habit. 



A North American lichen, recorded from Georgia, Alabama, Ver- 

 mont, and Massachusetts. 



XXX. Polychidium (Ach.) A. Zahlbr. 



Collema, section Polychidium Ach. Lich. Univ. 658. 1810. 

 Polychidium A. Zahlbr. Ascolichenes, 156. 1907. 



Thallus foliaceous, or more or less fruticose but decumbent, with 

 terete branches, with a well developed pseudoparenchymatous cor- 

 tex on both sides, or of pseudoparenchyma throughout; alga Scyton- 

 ema. 



