154 Rhodora [[Jury 
hilly parts of the state. Concerning the identity of the true D. aduncus 
(— Hypnum aduncum) the most varied opinions have been and are 
still held by bryologists. What appears to the writer to be the most 
satisfactory solution of the problem has been offered by Warnstorf, 
and the views of this author, as stated in a recent letter, will be pre- 
sented briefly. That the binomial Hypnum aduncum was first used 
by Linnaeus ! is universally admitted. Hedwig,’ however, misunder- 
stood the application of the name as used by Linnaeus and described 
as H. uncinatum the same moss to which Linnaeus had already given 
the name H. aduncum, while at the same time * he misapplied the latter 
name to a collective group of Harmdium (= Drepanocladus), forms 
having faleate leaves, with the diagnosis: “Trunco erecto, ramis 
patulis, foliis ovato-acuminatis incurvis summitatum secundis...." 
From this group several species, viz.— H. Kneifii Schimp., H. 
Sendtneri Schimp., etc., have since been split off, and at the present 
time opinion is divided as to the identity of Hedwig's H. aduncum. 
In view of these facts, and with the hope of clearing up matters, 
Warnstorf, following the procedure of S. O. Lindberg,* has dropped 
the Hedwigian combination H. uncinatum, which had been retained 
by most bryologists, in favor of the original Linnaean name H. 
aduncum, while he has designated as Drepanocladus subaduncus a 
Harpidium form which Hedwig certainly included in his H. aduncum 
group. To sum up, Hypnum aduncum Hedw. of American bryologists 
should be called Drepanocladus subaduncus Warnst., while Hypnum 
uncinatum Hedw. of American bryologists should be called Drepano- 
cladus aduncus (L.) Warnst., the binomial H. uncinatum being thus 
dropped altogether. 
In connection with the preparation of this paper thanks are due to 
Mrs. E. G. Britton, M. J. Cardot, Prof. J. F. Collins, Prof. W. G. 
Farlow, Mr. C. E. Faxon, Dr. A. J. Grout, Mr. E. L. Rand, and Dr. 
L. W. Riddle for data regarding the distribution of various species, 
or for the loan of specimens. The writer also wishes to express his 
appreciation to M. G. Dismier and Herr C. Warnstorf for their 
kindness in determining specimens of Philonotis and of Drepanocladus 
subaduncus respectively. 
YALE UNIVERSITY. 
1 Species Plantarum 1126. 1753. 
2 Descr. et Adumbr. Musc. 4:65. pl. 25. 1797. 
3L.c. 02, PI. #4. 
* Musci Scandinavici. 33. 1879. 
