232 PROCEEDINGS OF THE AMERICAN ACADEMY 



Fam. 4. Arthoniei. 



Arthonia cinnabarina (DC.) "Wallr. ; var. adspersa, Nyl. — 

 Trunks, Hawaiian Islands (Remy), Nyl. 1. c. 



Arthonia carib^ea (Acb.) Nyl., forma. — Trees, Oahu (Mann). 



Arthonia interducta, Nyl. — Trees, Oahu (Mann). — Spores 

 5-7-locular, but all the narrower sporoblasts broken (in these speci- 

 mens constantly, so far as observed) into smaller ones, and the spores 

 becoming thus submuriform-multilocular ; the large terminal sporoblasts 

 remaining entire. 



Arthonia platygraphidea, Nyl., e dcscr. — Trees, Oahu (Mann). 

 — Answering well to the described Mexican lichen, and remarkable 

 for its fusiform, 12-15-locular spores in oblong sporesacks, like those 

 of some Opegrapha. 



Arthonia astroidea, var. Swartziana, Nyl. — Trees, Hawaii 

 (Remy), Nyl. 1. c. 



Trib. IV. Caliciacei. 



Acolium protrudens. Tylophoron, Nyl. — Trunks, Waialua 

 Mountains, Oahu (Mann). — The separation of this type, as of the 

 Californian saxicoline species, from Acolium, on account of the dis- 

 tinct, excipular relation of the thallus to the proper exciple, appears 

 to be precluded by the structure, as well of other recognized mem- 

 bers of the group (as A. ocellatum (Flot.) Koerb.) as especially of A. 

 tigillare. These new forms may then be regarded as affording only 

 a better exhibition of the highest view of the generic type, as sug- 

 gested by the older ones. And ennobled thus, as by the lobulate 

 thallus of A. Calif ornicum, the present genus may claim perhaps 

 no uncertain place in the closest affinity to the fruticulose Acro- 

 scyphus. The Hawaiian specimens agree best witli Tylophoron pro- 

 trudens, Nyl., as exhibited in Lindig's N. Granada Lichens, the 

 apothecia being larger than in the T. moderation of the same work ; 

 but the latter (Lindig, herb. n. 2,653, 2,891, and 38, coll. 2 dae ) is 

 clearly inseparable, in my view, from the former. In 2,891 (T. mod- 

 ercttum) the spores also are smaller than in 2,G33 (T. protrudens) , but 

 in no. 38 though the apothecia are reduced, the spores cease to afford 

 any available difference. 



Acoeium Hawaiense (sp. nov.) : thallo tenuissimo glaucescente 

 cum hypothallo albido confuso ; apotheciis mediocribus elevatis lecano- 



