72 Rhodora [ FEBRUARY 
them I referred them to Mr. M. L. Fernald of the Gray Herbarium 
and he has determined them as Lens ervilea L. and Lens esculenta 
Moench. The plants were growing together and I had supposed 
they were all of the same species until I submitted them to Mr. 
Fernald, though after knowing the truth I was able to see that they 
were quite different from each other. 
On Aug. roth, 1902, I collected specimens of a plant which was 
growing in various localities such as the rear of outbuildings, dumps 
and similar waste places, and which though sparingly occurring was 
seen in at least four localities in Bangor. Mr. Fernald pronounces 
this to be Nonnea rosea Link of Europe.— O. W. Knicut, Bangor, 
Maine. 
THE ULOTHRICACEAE AND CHAETOPHORACEAE OF THE UNITED 
STATES.  — The plants included in the two families considered in 
this memoir are distributed all over the world, occurring abundantly 
in fresh water, and to a less extent in salt. Although the genera are 
pretty well marked, the species have been much confused, and prac- 
tically no critical work has heretofore been done on the American 
forms. The present memoir is a careful attempt to clear up the 
American field, and will be very welcome to all algologists. Dr. 
Hazen has studied the living plants, both in the field and in the 
laboratory, for several years; he has had at his command all the lit- 
erature and exsiccatae of the subject ; and the result will probably be 
the standard for a long time to come. The principles adopted in the 
nomenclature may be best understood by two quotations : — p. 139, 
* In nomenclature, the Rochester code has been followed generally, 
though perhaps not with absolute rigidity in the case of one or two 
generic names” :-— p. 136, “One great source of confusion has been 
the incorrect determination of specimens, particularly manifested in 
the practice of forcing a given form into a certain species, or in 
other words, stretching a specific diagnosis. .... In case of doubt it is 
much less confusing to make a new species.” As a result of the 
principle given in the first quotation, together with the principle of 
anchoring the generic name to the first species described under it by 
its author, two changes are made in generic names: 7Z7ibonema 
Derbés and Solier, in place of Couferva; Myxonema Fries, in place 
1 Mem. Torr. Bot. Club, Vol. XI, pp. 135-250, Pl. 20-42. 
