122 



slender paraphyses are almost colorless or of a faint rosy tint to light- 

 brown ; the hypothecium is colorless. The central portion of the 

 long stipes contains a very loose more or less reticulate hyphal tissue, 

 while the outer portion consists of closely adnate hyphal cells ex- 

 tending longitudinally ; the structure of these stipes, therefore, tends 

 toward the hollow cylinder. The short stipes are more uniformly 

 solid throughout ; in color they are nearly white, thus forming quite 

 a contrast to the thallus or the substratum. 



The spores are spindle-shaped to almost acicular, colorless, simple 

 or indistinctly two-celled or three-celled, usually bearing oil-globules, 

 and the spore-wall as well as the septa are thin. 



The Baeomyces are southern in their range, only about four 

 species occurring in the territory ; they usually grow upon sandy 

 soil, rarely upon rocks and rotten logs. 



PLATE 10. 

 BAEOMYCES ROSEUS Pers. 



1. Plants natural size upon sandy soil. 



2. Semidiagramatic section of apothecium, stipe and basal^ portion of 



thallus (magnified). 



3. Apothecium and portion of stipe (magnified). 



4. Section of apothecium. 



5. Section of thallus. 



a, protecting covering ; b, upper algal layer; c, hyphal tissue (con- 

 ducting); d, lower algal layer; e, rhizoids. 



6. Spore-sac with spores and paraphyses. 



7- Spores; a, oil-globules; b, indistinct septum ; c, simple spore. 



8. Cystococcus humicola (?) undergoing division. 



9. Gloeocapsa polydermatica. 



2. PILOPHORON Tuck. Syn. Lich. 46. 1848. 



Although it is not at all probable that Pilophoron is phylogenetic- 

 ally derived from Baeomyces its morphological characters are very 

 similar, or at least present such resemblances which could readily be 

 explained as evolutionary changes. 



The horizontal thallus (primary thallus) is deficient, consisting 

 of scattered crustaceous warts which are usually so small in size and 

 few in number that they are entirely overlooked. In structure they re- 

 semble the podetial warts and will be discussed later. The podetia, 

 which are neither more nor less than stipes covered by a thalloid 



