﻿6 Howe: The Anthocerotaceae 



apparently rare. Canada {fide Austin). Specimens from New 

 Orleans (Drumm. Muse. Am.— So. States— no. 154), White 

 Plains, N. Y. (L. M. Underwood, Sept. 28, 1896,) and Mus- 

 catine, Iowa (B. Shimek, October, 1896), differ from the ordi- 

 nary form in having the margins of the thallus here and there 

 glandular-thickened and the surface cells rather more distinct 



Anthoceros Oreganus Aust. is known outside of the description 

 only from a small and unsatisfactory specimen in the Austin col- 

 lection, which may be fairly presumed to be the original. The 

 packet bears on the outside the inscription in pencil " Anthoceros 



? Rocky Mts., Hall," and just above the dash '■ Oreganus' 



has been supplied later in ink, all evidently in Austin's hand- 

 writing. Inside the packet is a slip of manilla paper on which is 

 written u 24, moist earth, Oregon," in pencil by another hand, 

 probably Hall's. The involucres in this specimen are rather short 

 and 1-1.7 X 4-.6S mm., often somewhat widened at the mouth, but 

 not especially constricted above the middle as described by 

 Austin. The thallus is in a poor state of preservation. The 

 spores in size, color and markings seem identical with those of 

 the European A. lands and we see no sufficient reason for sepa- 

 rating it from this species. The thallus doubtless has glandular- 

 thickenings like the forms alluded to above. 



Anthoceros Mohrii Aust. was studied in the field by Austin, and 

 was pronounced * by him distinct from A. laevis, but it may be in- 

 ferred from his remarks that the comparisons may have been made 

 wholly with A. laevis var. major Aust. [A. Carolinianns Michx.). 

 The spores in the original specimen we find to be a little larger 

 than in the typical A. laevis instead of smaller as described by 

 Austin. They are, it is true, rather more coarsely and closely 

 granulate-papillate than in the ordinary forms of A. laevis, yet the 

 differences in this respect can hardly be defined with precision, 

 and certain specimens of Anthoceros laevis from other localities 

 show that this character cannot be depended upon. The thallus 

 is lightly lacunose with rarely a suggestion of a lamella-like ridge. 

 The tubers referred to by Mr. Austin were probably, for the most 

 part, Nostoc colonies, which were not recognized by him in their 

 true character in any of his descriptions of Anthocerotaceae. The 



* Bull Torr. Bot. Club, 6: 304. 1879. 



