OF ARTS AND SCIENCES : SEPTEMBER 11, 1866. 233 



roideo-depressisve, excipulo proprio in thallocle crasso margine radiato- 

 rugoso immerso, disco piano purpureo-nigro immarginato. Sporse octo- 

 n£e in thecis, minutae, obtusissime ellipsoideae, diblastse, fuscae. — Trunks, 

 Waialua Mountains, Oahu (Mann). — The interior exciple (white, inner 

 layer of the hypothecium) appears often (as more or less observable 

 also in A. protrudens) externally, making a membranaceous, lacerate- 

 denticulate border to the disk ; or once again, as in Thelotrema, this 

 border disappears, and is represented by a white, powdery, at length 

 irregularly cracked veil which conceals the here concave disk. Proper 

 exciple pale, so far as observed, immersed in a thalline wart, the thick 

 border of which is, more or less distinctly, radiately cleft, or striate. 

 Apothecium reaching a line in diameter. Spores averaging only one 

 third of the size of the largest ones of the preceding species, or in 

 length scarcely more than .006"°" ; those of the Hawaiian A. protru- 

 dens exceeding, at length, .018°'™. 



AcoLiuM Javanicum (Mont, and v. d. Bosch) Stizenb. — Trunks, 

 Oahu (Mann). 



Calicium tub^forme (Mass.) Sphinctrina^ Mass. S. microce- 

 phala, Nyl. — On thallus of Fertusaria sp., Oahu (Mann). 



Trib. V. Verrucariacei (Fr. 1821, Fee), Stizenb. 



JFam. 1. Endocarpei. 



NoRMANDiNA JuNGERMANNi^ (Del.) Nyl. — Growing on Sticta 

 cremdata in the mountains of West Maui, and on Pannaria molyhdcea 

 in Oahu (Mann). 



Fam. 2. Verrucariei. 



Trypethelium pallescens, Fee, Nyl. — Trees, "Waialua Moun- 

 tains, Oahu (Mann). * 



Ptrenula planitjscula. Verrucaria, Nyl., e descr. — Trees, 

 Oahu (Mann). — Not unlike V. insidata, Fee (determ. Nyl.), but with 

 spores of twice the dimensions. 



Pyrenula Cinchona (Ach. e Nyl. N. Gran.) Verr. prostans, 

 Mont. — Trees, Oahu (Mann). — Specimens also occur from the same 

 region, belonging apparently to the little cluster of forms which Dr. 

 Nylander (under his Verr. subprostans, Pyrenoc. p. 56) has regarded 

 as possibly reducible to a single species. In the size of the spores 

 these specimens approach rather to V. subprostans, but in shape to V. 



VOL. VII. 80 



