Trib. II. LECIDEACEL 



Apothecia free, rounded, patellseform, open, becoming 

 more or less convex, or cephaloid ; the disk bordered by a 

 proper exciple ; the thalline exciple of the first Tribe nor- 

 mally deficient here. 



Fam. 1. CLADONIEI. 



Thallus two-fold; a horizontal one, squamulose or granu- 

 lose (now obsolete) ; and a vertical, caulescent one, becom- 

 ing shrub-like (podetium). 



XXXIX. STEREOCAULON, Schreb. 



Apothecia patellseform ; solid. Spores fusiform, or acic- 

 ular; 4-plurilocular ; colourless. Spermatia from oblong 

 becoming oftener staff- shaped; or acicular; on simple 

 sterigmas. Podetia shrub-like, erect, solid ; clothed more 

 or less with certain granules (phyllocladia) which become 

 squamiforrn, or pass into coralloid branchlets; being also 

 now extended, at the base of the podetia, into a horizontal 



crust. For the anatomy of the thallus see Schwendener 



Untersuch. 1. c. 2, p. 173, t. 7, /. 10, 11. That remarkable 

 and common excrescence of the thallus which Nylander has 

 considered, under the name of cephalodium, in his Syn. p. 

 231, etc., has been further examined by Dr. Th. Fries (Flora, 

 1868) and lastly by Schwendener (Die Algentypen d. Flech- 



tengonid. p. 16, 27, 33) ; but remains still unexplained. 



For the distribution of Stereocaulon see G-en. Lick, p. 144. 



* Eustereocaulon. Phyllocladia always present. 



1. S. ramulosum (Sw.) Ach. ; podetia tufted, erectish, spar- 

 ingly for the most part and irregularly long-branched ; contin- 

 uously at first corticate-granulate at least at the summits, and 

 now also tomentose j phyllocladia ashy-gray, and whitish, pass- 



