— 76- 



These envelopes are attached to the sheet by pins, the size known to the 

 trade as Lill pins being used. In most cases two pins suffice to hold the 

 envelope in place. The pins should be placed about one-third the width of 

 the envelope from the top, and far enough from the ends to permit of easy- 

 opening. Usually twice the width of the flap folded under, will be sufficient 

 for this last. The pins, of course, pass through the back of the envelope 

 and the mounting sheet in such a manner that both head and point of the pin 

 remains inside the envelope. 



By this method no rough surfaces are left to catch in other specimens, 

 the specimen is held securely in place, yet it is but a moment's work to trans- 

 fer it to another sheet whenever occasion arises. This ease of transference 

 is especially convenient if one wishes to arrange the specimens of each 

 species with regard to geographical distribution, and so be able to accommo- 

 date new packets in their proper places. The same is true in the case of 

 erroneous determinations. The small holes left by the pins can easily be 

 closed by the pressure of the thumb, and the portions of the pin inside the 

 envelope do not injure the specimens. 



I have given this method a careful trial in my own collection, and have 

 also used it in mounting the larger portion of the mosses m the Brown Uni- 

 versity Herbarium. I find that it works well in practice, and that, with 

 ordinary care in handling the mounted sheets, answers all demands, A 

 very little practice in this manner of mounting, enables one to work rapidly 

 and the sheets can be filed away in the herbarium at once, without any 

 bothersome wait for drying of glue. Washington, D. C. 



BUXBAUMIA APHYLLA L. 



In March, 1903, while collecting in open woods along the banks of the 

 Potomac river, about two miles above Cabin John Bridge, Maryland, Mr. W. 

 R. Maxon and the writer were fortunate enough to secure several plants of 

 Buxbau7nia aphylla, L,, in good fruit. I am not sure whether or not the 

 plant has been previously reported from this vicinity, but it seems best to 

 make a definite record of this collection. Specimens are in my own and m 

 Mr. Maxon's collections. Edward B. Chamberlain. 



UCHENS-NEPHROMA-SOLORINA. 



By Carolyn W, Harris. 



The genus Nephroma, which is not a large one, is represented by sev- 

 eral well defined species. It_is an interesting group from the peculiarity of 

 its fruiting as it is the only genus where the apothecia are borne on the 

 lower side of the extended lobes of the thallus. This distinguishes it readily 

 from Peltigera where the thallus is very similar. The range of Nephroma is 

 northern, the finest specimens having been collected in alpine or arctic 

 regions. It is found on rocks and tree trunks in shaded and moist localities. 



The thallus is frondose or composed of leaf-like sections overlapping each 

 other, in some species it is smooth and polished, in others somewhat tomen- 



