OF ARTS AND SCIENCES: APRIL 12, 1864. 265 



has been already cited, and should be compared with that which I 

 have ventured to prefer ; but it may be added that no other species 

 appears so fully illustrative of the present one. 



Stereocaulon pilophoroides, sp. nov. : podetiis elatis erectis 

 validis simpliciusculis apicem versus parce ramosis ruguloso-subcorti- 

 catis etomentosis albidis phyllocladiis e verrucisformi dein subelongatis 

 exasperatis ; apotheciis terminalibus mediocribus disco mox semigloboso 

 njo-ro margine albido flexuoso-irregulari. Cephalodia scrobiculato-fove- 

 olata, granulis gonimis in nodulis cylindraceis irregulariter dispositis. 

 Sp. in thecis oblongo-clavatis octonte, e fusiformi aciculares, 4- 10-blasta;, 

 diam. 10-24° longiores. Spermatia acicularia, falcato-curvata, sterig- 

 matibus simplicibus. Sandwich Islands, Dr. W. Hillelrand. "With the 

 aspect of Pilophorus, but the apothecia, spores, and spermatia of Stereo- 

 caulon ; in which genus it belongs to the neighborhood of S. ramulosum. 

 Podetia four to five inches high, stout but brittle, dividing into two or 

 three long branches above the middle, which part distichously, or send 

 out irregularly, short branchlets terminated by the subglobose, black 

 apothecia. Phyllocladia more or less confluent, especially above, but 

 passing into papillcB, which towards the base are elongated and terete. 

 The thin hypothecium is blackish-brown ; the thalamium proper Jess 

 colored, with filiform, sometimes branched, brown-headed paraphyses. 



Placodiuji cladodes, sp. nov. : thallo erecto dichotomo-ramoso 

 ramis teretibus fastigiatis in crustam papillatam aurantiacam ca3spitoso- 

 stipatis ; apotheciis sub-mediocribus sessilibus disco piano pulverulento 

 fulvescente submarginato, margine thallino demum crenulato. Sp. in 

 thecis brevibus saccato-oblongis singulte, mediocres, incolores, obtuse 

 ellipsoidea^, diblastJB, diam. subduplo longiores. On the earth, in the 

 alpine regions of the Rocky Mountains, Mr. E. Hall. Apparently 

 crustaceous, but in fact fruticulose, and, so far as I am awax'e, the first 

 distinct indication of that type of thallus in the yellow, Parmelia- 

 ceous Lichens with bilocular spores. Thallus of the lichen before us 

 rather exceeding (in the specimens, which do not show the organic or 

 other substratum upon which it grows) a quarter of an inch in height ; 

 the erect branches solid, not very fragile, terete, much and fastigiately 

 branched, and closely crowded together, blackish at the base, but be- 

 coming paler above, where they pass into the papilteform branchlets 

 which constitute the crust-like, warted, orange-yellow surface. Apothe- 

 cia a little darker than the crust, powdery, the disk sometimes margi- 



