38 - 
iropa. But P. perforata and P. hypotropa are absolutely identical, 
proved in numberless specimens that present the characters of both 
in an individual plant. To certain specimens of so-called P. hypotropa 
coming from the Gulf States, entirely white beneath, the name of 
hypotropa might be applied, but in no other sense than that of merely 
a state or form as in Tuckerman’s view. 
NEPHROMA LUSITANICQM Schaer. Enum. p. 323. Over mosses 
at the base of trees, South Thomaston, Maine, Sept. 1909, and de- 
tected in material from Nova Scotia, collected by Prof. J. Macoun. 
Previously unrecorded from Eastern America so far as I know. 
LECANORA SUBTARTAREA Nyl. Flora 1882, p. 550. On trunks 
of spruces and once on birch, Knox County, Maine, and on spruce, 
Nova Scotia, Prof. J. Macoun. Reaction KHO+yellow, with CaCl the 
varioloid outgrowth is tinged reddish. A peculiar plant easily to be 
taken for a Pertusaria. Our specimens are all without apothecia, but 
comparison with authentic material makes the determination certain. 
Unrecorded from America so far as I know. 
Leptogium {Mallotium) pilosellum Merrill sp. nov. Thallus 
irregularly orbicular, moderately expanded, appressed centrally but 
somewhat free and slightly undulate toward the circumference, mem- 
branaceous, brownish-green when dry but blackish-green wet, sub- 
monophyllous, irregularly lobate at the circumference, the axils 
acute, the margins of the lobes smooth or minutely notched and in- 
terruptedly white-/?//055, cortex here and there smooth but mostly 
scabrous, beneath colored much as above and interruptedly hirsute 
with simple white rhizoids 1-5 mm in length. Apothecia small, 
plane, reddish or brownish, the thalline margin more or less densely 
white-/)/7c>55. Spores fusiform-ellipsoid, bilocular, each sporoblast one 
or more nucleolate, 20-24 X 7-8/^. Paraphyses articulated, rather 
discrete. Algae blue-green, in clusters, no distinct chains observed. 
On mosses over rocks, Goldendale, Wash. A. S. Foster, No. 1186. 
Rockland, Maine. 
REVIEWS, CURRENT LITERATURE. 
EXOTIC MOSSES. 
C. Heinrich of Dresden has just issued the first part of Dr. Georg 
Roth’s “ Die Aussereuropaischen Laubmoose,” mc\vLd\ng Andreaeaceae 
with seven plates and beginning the Archidiaceae including the generic 
description and the key. This is the beginning of a stupendous under- 
taking, no less a task than figuring and describing, as far as possible 
from original or type specimens, all the mosses of the World, other 
than those that occur in Europe. It promises well for the success of 
this undertaking, that he has secured the cooperation and loan of 
material from Messrs. Brotherus and Cardot, Levier, and others, and 
