OF ARTS AND SCIENCES. 169 



nanrlez, Rev. T. Hill (Hassler exp. 1872). Thallus with something of 

 the aspect of an Endocarpon not remote from E. miniatum v. aquuti- 

 cum, Schjer., but the internal structure of Pannaria § Coccocarpia. 

 Collogonidia disposed in short chains. Hymeneal gelatine becoming 

 first blue, and then wine-red with iodine. I cannot compare the spe- 

 cies witli any other. Spermogones have not occurred. 



Paxxakia Soxomensis, sp. nov. : tliallo ^Jarvulo radiante olivaceo, 

 laciniis linearibus ramosis striatis, centralibus teretiusculis dein intrica- 

 tis, periphericis magis dilatatis flabellatisque dichotomo-multifidis, subtus 

 albis uudis hypothallo obsolete ; apotheciis minutis (0,3-0,4 millim. 

 latis) lecanorinis, margine iutegro dein excluso, disco e rufo-fusco 

 nigricante. Sporte fusiformes, curvuh^, simplices, incolores, longit. 

 0,020-33"""-, crassit. 0,002-3'"*- Hypothecium pallidum. Paraphyses 

 dein lax£e. — Rocks, Sonoma, and also in the Yosemite Valley, Cali- 

 fornia, Dr. H. N. Bolander. Interior of the thallus compact ; of elon- 

 gated cells. Collogonidia solitary or concatenate; reaching 0,018""°' in 

 length by 0,009"""' in width. Spores fusiform in the sense of Koerb. 

 Syst. t. 3, f. 5 ; and they might be called short-acicular. Belongs to 

 the same group with P. Jlabellosa (Ohs. Lich. 1. c. 5, p. 401) and P. 

 Petersii ( Gen. Lich. \). 54). The resemblance of the interior structure 

 of P. jlabellosa to that of the lichen before us has been well exhibited 

 bv Schwendener {Erijrt. z. Gonidien-frage, Flora Ratisb. 1872, p. 227, 

 t. 4) in the infertile Yosemite specimens sent to him as " Pannarice 

 affinis." It appears quite impossible to remove these plants from Pan- 

 naria ; or to continue to keep Pterygium, Nyl. apart from them in 

 genus. 



Paxx'aria stenophtlla, sp. nov. : thallo orbicular! zonatim ceu' 

 trifufo olivaceo, laciniis tereti-compressiusculis, centro squamuloso-dirai- 

 nutis delabentibus, ambitu radiantibus ramosis, subtus pallidis nudis 

 hypothallo obsoleto ; apotheciis lecanorinis perminutis (latit. 0,2-0,3 

 millim.) disco fusco margine tenui dein disparente. Sporge ex ellip- 

 soideo oblongaj, sa^pe curvul^, biloculares, longit. 0,012-20"""-, crassit 

 0.003-5"""- — Lime rocks, Moulton, Alabama, Hon. T. M.Peters, 1874. 

 Thallus from a quarter to little more than half an inch in diameter. 

 Structure of the interior of the thallus as in the last species ; collogo- 

 nidia in chains; at length 0,012-20"""- long, and 0,010-12 """thick. 

 The lichen grows with and often commingled with P. Petersii, from 

 which it is readily distinguishable by its smaller size, lighter color both 

 of thallus and fruit and terete lobes. P. Sonomensis is nearer, but 

 exhibits a different habit of growth, and the spores are quite irrecon- 

 cilable with those of the Alabama lichen. 



