—49 — 
Authentic and complete lists of mosses of limited areas are of great 
value and interest to the systematist, and also to the general biologist by rea- 
son of the bearing of plant distribution on the problems of evolution. Of 
course absolutely complete lists are an impossibility, they can only be com- 
plete as far as recorded observation goes. 
The Bryophyta and Pteridophyta of Pennsylvania by the late Prof. T. 
C. Porter, edited by Dr. John K. Small, and published by Ginn & Co., is one 
of the best of such lists. It seems unfortunate to the reviewer that certain 
changes in nomenclature have been made, but in spite of the efforts for uni- 
formity there seems still to be a wide variation of taste in the matter.- 
In Rhodora for May, 1906, A. LeRoy Andrews gives a list of “ New 
England Sphagnaceae, ” with some notes. It may be of interest to our 
readers to know that Mr. Andrews has consented to take up work on the 
Sphagnaceae with the Sullivant Moss Chapter on his return from Europe. 
In the same journal for July, 1906, Mr. J. Franklin Collins gives a simi- 
lar list of th & Buxbaumiaceae, Georgiaceae and Polytrichaceae. Some refer- 
ence to this list has previously been made in the Bryologist ( 9 : 101) and 
some extracts from his notes reprinted. 
NORTH AMERICAN MUSCI PLEUROCARPI ISSUED BY 
DR. A. J. GROUT. 
John M. Holzinger. 
Century III of this splendid series, published by Dr. A. J. Grout, Brook- 
lyn, N. Y. , has just been completed, the twelfth fascicle having come to hand 
at this writing, Jan. 30, 1907. A general review of this work is demanded 
at this juncture, both on account of the work itself, and also for the benefit of 
all whom the author has placed under lasting obligation by his long sus- 
tained, painstaking effort on this collection. This work has been made pos- 
sible only by much self-sacrifice on the part of the author, aided, to be sure, 
by the generous help of all contributors in various parts of the country. The 
writer has himself contributed a number of species, but he knows from 
experience that the collecting is the lesser task by far. Dr. Grout’s work 
looms up larger and larger in my appreciation as I experience what such a 
publication requires in time and sacrifice of pleasures and neglect of routine 
and social duties. 
This twelfth fascicle is accompanied by a four page pamphlet, more than 
three pages of which are taken up with the alphabetical enumeration of Cen- 
turies I— III. The last page contains critical notes on Century III. Simi- 
lar lists of notes accompanied Centuries I and II after each was completed. 
Since this series is widel} r distributed among European as well as American 
bryologists, there is no doubt that further critical notes and certainly 
critical references will appear in the future in bryological journals on both 
sides of the Atlantic. No scientific institution in which work along this line 
is carried on can well afford to do without this help. Time and lack of space 
forbid the enumeration of the new and rarer species so far distributed. Any 
one really interested and desiring to know about this collection will surely 
