52 — 
extended by a single locality in Scotland, 2 several in Sweden, 3 and in Siberia, 4 
also in the Alps. 5 As another link in the chain of its circumpolar distribution 
Iceland is of passing interest. It was found during the summer of 1914 (July 
18) in a single locality near Reykjavik. This city is situated on a small pen- 
insula which runs a short distance further to the northwest terminating in a 
point Grotta with lighthouse. The point is cut off as an island at high tide. 
Nearer the city rises a slight hill, itself perhaps at one time an island, at any rate 
at high tide. It is strewn with fragments of rock like the other glaciated low 
hills about the city and shows also outcroppings of the preglacial doleritic lava 
characteristic of the immediate region. Among several interesting bryophytes 
which had established themselves here was the Odontoschisma growing in small 
quantity mixed with other hepatics and mosses on the ground about a large 
rock. Though considerable search was made in various other localities no 
further trace of the plant was found (in fact, no other Odontoschisma of any 
species), so that it is evidently not common in Iceland. 
As to the specific worth of this plant as separate from 0 . denudatum Husnot 
has recently 6 expressed doubts. Without being able to contribute anything to 
the discussion of this question I would only record my impression that the two 
species are easily distinguished both in the field and under the microscope. 7 
Ithaca, N. Y. 
THE USNEAS OF THE WORLD, 1752-1912 
With Citations, Type Localities, Original Descriptions, and Keys 
Part II. — South America 
[Concluded] 
R. Heber Howe, Jr. 
9. Usnea Bornmuelleri var. brasiliensis Zahlbr. 
“inter Faxina et Apiahy,” “Prow Sao Paulo.” 
(Denksch. math, naturw. Klasse kaiserl. Akad. Wissen. 83 . 187. 1914.) 
“Thallus subprocumbens, subochraceo-vel sulfereo-lutescens, opacus, ramis 
primariis teretibus, usque 2 mm crassis, parce et leviter articulatis,_ minute papij- 
losis, dichotome et sympodialiter ramosis, ramulis curvatis vel uncinatis, sorediis 
sat crebris pallidioribus, parvis, fere, verruculiformibus, demum pulverulentis et 
hinc inde confluentibus ornatis, spinulis haud evolutis; strato myelohyphico 
albo, laxo, KHO e flavo mox ferrugineo, J vix lutescente.” 1 . c. 
Type in the Royal Botanic Gardens, Vienna. 
Usnea Ceruchis Montg. (Amer. Sci. Nat. Bot. 2 : 368-369. 1834.) 
= Ramalina ceruchis Ach. 
2 Macvicar, Handbook of British Hepatics, 301. 1912. 
3 Arnell & Jensen, Moose des Sarekgebietes, I, 78L 1907. 
4 Arnell, Zur Moosflora des Lena-Tales, 14. 19x3. 
5 K. Muller in Rabenhorst, Kryptogamenflora, VI, 2, 225. 1913 
6 Revue bryologique, XLI, 7 1 fT. 1914- 
iQ. denudatum has been reported from a single station in Iceland. 
