﻿2 Howe: The Anthocerotaceae 



ditional species have been proposed by Austin. It will thus be 

 readily understood that for any adequate review of the North 

 American species of this order, access to the herbarium of Mr. 

 Austin is a necessity. But, unfortunately, after the death of Mr. 

 Austin, his collection of Hepaticae was allowed to leave America, 

 having been purchased by Dr. Carrington and Mr. Pearson, of 

 England, between whom it was divided, Dr. Carrington's portion 

 going finally to the Owens College of Manchester. The incon- 

 venience to American students, of having the Austin collection 

 on the other side of the Atlantic is, however, largely compensated 

 for by the ready liberality of Mr. Pearson, and also of Professor 

 Weiss of the Owens College. Through the kindness of these 

 gentlemen in sending whatever was asked for, we have been able 



A 



Anthocerotaceae 



exception of Anthoceros Joorii, which is probably of little moment 

 as it was finally reduced to A. Ravenelii by Austin himself. We 

 are also much indebted to Professor Romauldo Pirotta, of the 

 University of Rome, for generously sending for examination the 

 scanty fragments of Anthoceros caespiticins De Not., from the De 

 Notaris herbarium — all that is certainly known to exist of this ob- 

 scure species; to Professor Massalongo for specimens of Anthoceros. 

 dichotomies Raddi from the Raddian herbarium ; to the Philadel- 

 phia Academy of Natural Sciences for the loan of the Schweinitz 

 collection ; to Dr. B. L. Robinson for the privilege of examining 

 Anthoceros taberosus Tayl., from the Taylor herbarium; and to 

 Herr Stephani, Dr. Evans, Professor Macoun, and Rev. C. H. 

 Demetrio for various specimens. Outside of the specimens named, 

 the present revision is founded on the herbarium of Professor 

 Underwood, the collections of the writer in California, and the her- 

 barium of Columbia University. To Professor Underwood, who- 

 has facilitated the work in all possible ways, our thanks are espe- 

 cially due. 



ANTHOCEROTACEAE. 



Gametophyte a wholly leafless thallus, commonly flat, orbi- 

 cular, or semiorbicular, more or less lobed or radiately dissected, 

 sometimes subpinnate (Dendroceros), or ribbon-shaped and sub- 



