22 Jllhioh State Lahorafori/ r,f X(itnrnl History. 



tenuis). Thullus at first radiately divided from the centre, 

 which often soon decays; the divisions bifid or di-trichotomous, 

 plane, depressed or canalicuLate above, and usually convex and 

 naked or squamulose beneath; margins either naked or spinu- 

 lose-ciliate. Epidermis usually distinct, eporose; air cavities 

 evident in some species, wanting in others. Rootlets papillose 

 within (except in R. Frost ii). Named for Bicci, an Italian 

 botanist. 



§ 1. LiCHENODES Bisch. Thallus solid, irithout air cavi^ 

 ties; fruit mosthj protnherant ahore; spores about 0.084 mm. in 

 diameter, amjular, issuing throur/h openings which at length ap- 

 pear in the itpper surface of the thalJns. Terrestrial species 

 growing on damp, usually trodden or cultivated ground, and 

 closely adhering to it. 



* TJkiIIhs jxiked on the margins or underneath (without cilia or 



scales). 



1. R. Frostii Aust. Thallus orbicular, 1.3 — 2.5 cm. in 

 diameter, subsolid, thinnish, subpalmately or radiately divided, 

 cinereous-green, fibrously reticulate, minutely pitted and either 

 plane or channeled above, concolorous or tinged with p)urple 

 toward the apex beneath, very narrowly membranous, somewhat 

 papillose-squamulose, and often tinged ui'th purple on the mar- 

 gin; divisions linear or subspatulate-linear, subdichotomous; 

 lobes subtruncate and indistinctly emarginate; rootlets smooth 

 or obsoletely papillose within; capsules irregularly disposed, 

 very prominent underneath; spores nearly round, barely 0.051 

 mm. in diameter, fuscous, somewhat margined, minutely and 

 obscurely reticulated and granulose-papillose, the sides strongly 

 depressed when dry. 



ffofe.— Nev. (Watson), Col. [Wolfe), 0. [Bearddee), 111. {Hall). 

 Bib.— Toney Bull. VI, p. 17. 



2. R. Watsoni Aust. Dioecious; thallus of male j^l out 

 small, fuscous-purple both sides, orbicular, deeply and many 

 times divided, thick, fleshy, broadly pitted, papillose, fibrous- 

 reticulate and with rather large, terete subclavate, gland-like 

 papillre (ostioles?) above, densely radiculose and nodulose be- 



