Howe : American Species of Alectoria 



127 



" It still remains to add here the diagnosis of a new western 

 lichen, kindly sent me by Mr. Henry Willey, New Bedford, Mass. 



"Alectoria pacifica Stzb. n. sp. 



" Thallus fruticulose, prostrate, rigid, terete, smooth, brown and 

 shining, from I to 1.5 cm. in length, 1-0.5 mm - i n width, very 

 much divaricately branched, the branches flexuous, densely in- 

 tangled, 0.05 mm. in width, apothecia and spermogonia unknown. 



"The anatomical structure perfectly agreeing with Alectoria; 

 no traces of an orthogonal-trajectoric direction of hyphae (as it 

 is found in Cetraria aculeata). Cortical and medullary layer 

 equal, nearly longitudinally running filamentous elements. No 

 central cavity ; medullary layer cottony, very loose, sprinkled with 

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

 of the thallus bordered with a very thin light-brown line. The 

 cortical layer neither thickened nor interrupted by layer cavities 

 (which are frequent in the older cortical tissue of Cetraria). No 

 reactions on application of hydrate of potassa and hypochlorite of 

 lime. 



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

 humous earth, by Dr. [E.] Palmer [in 1875]." 



Note: Alectoria diver gens abbreviates Mull. Arg. Lich. Ore- 

 gonenses, Flora, 72 : 362. 1889. This form was described as 

 follows: " Mt. Hood in Oregon, ad terram et ramulos dejectos: 

 n. in, forma abbreviata, vix pollicaris, compacta, fertilis, sporis 

 8 n , 6-9//, longis et latis." 



Alectoria jubata (L.) Ach. Lich. Univ. 592. 1810 

 Lichen jubatus L. 1. c. 



Type: Species based on Usnea jubata nigricans, etc., of Dil- 

 lenius ; the Dillenian specimens " sterile . . . quite typical " are 

 in the Dillenian herbarium, Botanic Gardens, Oxford, England, 

 and are Alectoria jubata (prolixa), Ach. fide Crombie. In the 

 Linnaean herbarium the species is represented by composite 

 material, though "No. 73 — in 1 folio: Alectoria chalybeiformis 

 prolixa (Ach.)... in alio folio ... Alectoria jubatae Wainio," 

 fide Wainio. 



Type locality: " Europae." 



Original description : " filamentosus pendulus : axillis com- 

 pressis," L. Sp. PI. 2: 1155. 1753. 



