112 Rhodora [JUNE 
while in Rhadinocladia, as will be seen by the following description, the 
frond has an abundant ramification. 
Rhadinocladia Farlowii, n. sp. Olive brown, growing in tufts, in 
which the individual fronds are plumose and 12-16 mm. high. Each 
frond is made up of a narrow, percurrent axis, with two series of 
cuboidal cells near the base, gradually increasing in number until four 
series are found at the center. ‘This base is 40-50 u wide and the 
central part 60—70. From the axis arise 30—50 flagellate branches, 
6—8 mm. long, consisting of a single series of cells (rarely two or three 
side by side) about 25 4 wide, and ending in two or three long hairs; 
near the tip the branches may bear a few ramuli. ‘The ramification is 
rather irregular as the branches commonly arise singly, but they are 
often opposite or in a cluster of three. Only the plurilocular sporangia 
are known, which are muriform, and arise from transformed branches. 
They are nearly or quite sessile, oblong or elliptical-oblong, bluntish, 
20-25 p wide, 70-85 p long. Except near the base the whole plant 
is clothed with hyaline hairs, 1-2 mm. long, of 5—ro linear cells about 
12 p wide. 
Growing on Chorda, and washed ashore at Vineyard Haven, Mass., 
August 27, 1892. 
A slide of the type is deposited in the Cryptogamic Herbarium of 
Harvard University, and one at Columbia University. Later another 
will be placed in the National Herbarium. 
The writer would also tender due acknowledgement to Mr. F. 
Schuyler Mathews for his great courtesy in making the beautiful and 
accurate drawings which are reproduced in the plate accompanying 
this note. 
BnpirsrOr, R. I. 
EXPLANATION OF PLATE 18.  AZaainocladia Farlowii, Fig. 1, Terminal 
portion of the axis of a frond, showing general habit. Figs. 2 and 3. Portions of the 
same ( more highly magnified) showing branches, hairs, and plurilocular sporangia 
in greater detail. 
NOTE UPON A PROBABLE HYBRID OF ROSA CAROLINA 
L. AND ROSA NITIDA WILLD. ; 
FRANCOIS CRÉPIN. 
In my note entitled Nouvelles remarques sur les Roses americaines 
(Bull. Soc Roy. botanique de Belgique, tome xxvii (1889), 2"* partie, 
pp. 28 et. 29), I referred to a rose which I was inclined to consider a 
hybrid of Rosa carolina and R. humilis. 
