lAchens 5 d 



VERRUCARIACEAE 



Verrucaria striatula Wahl. in Ach. Method. Suppl. p. 21 (1803). 



On beach pebbles, sandspit of Hulahula river, Alaska; on beach pebbles, 

 Icy reef, Alaskan arctic coast. 



This lichen is so rare in America it is thought best to describe it. Thallus 

 brown, greenish-brown or black, gelatinous, of diverging, radiate ridges, or these 

 irregularly or dendritically arranged. Perithecia seated on the ridges, centrally 

 situated, minute, with a large central pore, perithecial wall dimidiate. 



Spores 8, colourless, ellipsoid, 8-9 x 4-5iU. 



Known from one locality in the United States, on pebbles bordering a 

 river in Weymouth, Mass. 



Verrucaria striatula Wahl. forma dealbata f. nov. 



Thallus aut omnino aut in parte dealbatus, vel denique obsoletus, peri- 

 theciis persistentibus. In hoc statu perithecia dealbata vel solitaria vel in 

 lineas breves disposita sunt. Sporae ut in specie. Forma dealbata cum planta 

 typica videtur. 



Distinguished from the species by the thalline ridges becoming partly or 

 wholly dealbate, or the thallus at length obliterated with only the perithecia 

 persisting. In this condition the perithecia may be solitary or arranged in 

 definite short lines, and wholly dealbate. 



The spores are identical with those of the species, and the dealbate form is 

 to be found accompanying the typical plant. 



Polyblastia scotinospora (Nyl.) Hellb. inVet. Akad. Forh. p. 478 (1865). 



On rocks, Sadlerochit river, 20 miles inland from Camden bay, Alaska. 

 Probably new to North America. 



SPHAEROPHORACEAE 



Sphaerophorus coralloides Pers. in Ust. An. I: p. 23 (1794). 



On tundra, Collinson point, Alaska; tundra, between Port Clarence bay 

 and Teller, Alaska. 



The distribution of this species is peculiar. It is found as far south as 

 Oregon on the west coast, and at the sea level at Eastport, Maine; but in our 

 eastern mountains it is an alpine plant. 



LECIDEACEAE 



Lecidea contigua (Hoffm.) Fr. Lich. Eur. p. 298 (1831). 

 On rocks, WoUaston peninsula, Victoria island. 



Lecidea Wulfenii Koerb. Parerg. Lich. p. 246 (1860). 



Over mosses, Bernard harbour. Dolphin and Union strait. 

 Not appearing in the Cummings List. 



Lecidea aglaea Sommerf. Suppl. Fl. Lapp. p. 144 (1826). 

 On rocks, Bernard harbour. 



Lopadium pezizoideun (Ach.) Koerb. Syst. Lich. Germ. p. 210 (1855). 

 Heterothecium, Tuck. Syn. 

 Over mosses, Collinson point, Alaska. 



Rhizocaipon alboatrum (Hoffm.) Th. Fr. Arctoi, p. 237 (1861). 



Buellia Tuck. Syn. 



On dead branches of living white spruce, Coppermine river; driftwood and 

 old logs, Collinson point, Alaska. 



