COMPLIMENTS OF AUTHOR. 



Musci Acrocarpi Boreali-Americani. 



CENTURY I. 



The four fascicles comprising this century were all issued during 

 1904, fascicle 1 appearing- in January, fasc. 2, in March, fasc. 3, in May, 

 and fasc. 4 in September. Some errors have been corrected by recipients, 

 and these corrections will be noted in the proper place below. If addi- 

 tional corrections and criticisms are made, these will be published in 

 connection with notes on the second century. 



In some cases the quality of .the material distributed, the plants 

 being- sometimes sterile and sometimes imperfect or imperfectly devel- 

 oped, is not all that could be desired. I have uniformly spared no effort 

 to secure the best that was available. And if the first distribution can 

 be improved by material subsequently offered, it is my purpose to dis- 

 tribute the better material, so far as is reasonable, without extra charge, 

 that is, under the old numbers. This has been done already in quite a 

 few cases. 



As appears from the labels, contributions for this series have been 

 received from Dr. A. J Grout, Mrs- S. B. HadlEy, Miss Mary F. Mil- 

 iar, Mrs. Josrphine D. Lowe, Mk. W. W. Fggleston (comm. Dr. Grout), 

 the late Mr. D. A. Burnett, (comm. Mrs. A. M. Smith), Mr. W. R. 

 Maxon, Mr C. N. Ainslie, Prop. F. B. Chamberlain, Prop. L. M. Um- 

 bach, Mrs. W A. Wii,i,iams, Mrs. Agnes Chase, Prof. J. B. Feett, 

 Dr. J. W. Bailev, Mr. Virginius Chase and Mr. S. Rapp. Grateful 

 acknowledgment is due to all these contributors. But the many 

 contributions from Mr. Rapp, collecting in Florida, and from Dr. Baily, 

 collecting in Washington, deserve an expression of especial gratitude in 

 this connection. I only wish I could find as enthusiastic and as thought- 

 ful collectors in other sections of the country. 



In the matter of nomenclature I have endeavored to be guided by 

 the Rochester Code. Working at a distance from large libraries it has 

 been necessary to lean somewhat on second-hand information for 

 data to establish priority. And if errors have crept in on this ac- 

 count I shall consider it a favor to have fellow workers more favorably 

 stationed make the necessary corrections. 



Following are the criticisms and corrections of the first Century: 

 No. 4. Gymnostomum caJcareum winonense Holz- 

 Dr. Best doubts whether this moss should be considered a variety of Gymno- 

 stomum caleareum. He finds "a membrane closing the mouth of the capsule." quite 

 evident directly after the falling of the operculum. In a short time this membrane 

 shows an opening in its center with a rim adhering to the inner surface of the capsule 

 wall Possibly the capsnies of the typical G. caleareum show this struct- 

 ure: and it may therefore be regarded as a transition form to a better development 

 as found in Hymenostomum". 



