538 CALIFORNIA ACADEMY OF SCIENCES. 



The anatomical structure perfectly agreeing with Alec- 

 foi'ia; no traces of an orthogonal-trajectoric direction of 

 hyphaj (as it is found in Cetraria aciileata ) . Cortical and 

 medullary layer with equal, nearly longitudinally run- 

 ning filamentous elements. No central cavity; medulla- 

 ry layer cottony, very loose, sprinkled with heaps of go- 

 nidia (these 0.004-8 mm. in diameter). Thin sections of 

 the thallus bordered wdth a very thin light -brown line. 

 The cortical layer neither thickened nor interrupted by 

 larger cavities (which are frequent in the older cortical 

 tissue of Ceti'aria). No reactions on application of hy- 

 drate of potassa and hypochlorite of lime. 



Found in the Island of Guadalupe (Pacific Ocean), on 

 humous earth, by Dr. Palmer. 



