301 
able.* The stations for W Jurcata are North Conway, New 
Hampshire (James); Lancaster County, Pennsylvania (Porter) ; 
Delaware Water Gap (James), North Carolina (Ravenel). M. con- 
jugata has a much wider distribution. 
In addition to the above the following corrections may be 
made: 
P. 705, Frullania Pennsylvanica, Steph., should be stricken 
from the list, having been founded on some form of Jubula 
flutchinsie, as we learn from Dr. Stephani himself. 
P. 718. Harpanthus Flotovianus has been found by Mr. Wag- 
horne in Labrador, as noted in the September number of the 
BULLETIN, and will doubtless be found in Northern New England. 
The words « certainly extralimital” were never our thought, and 
were added to the MS, after it left our hands. 
P. 719. Var. attenuata will stand as a species and should read, 
Jungermannia attenuata, Lindenb. 
LuciEN M. UNDERWOOD. 
Greencastle, Indiana, 27th July, 1892. 
Interesting Oaks Recently Discovered on Staten Island. 
By Wix11aM T. Davis. 
IL—A number of black scrub oaks, Quercus ilicifolia, occupy 
the sandy ground at Watchogue on Staten Island, and associated 
with them, particularly in the dryer situations, are many Black 
Jack oaks, Quercus nigra. These trees are easily separated, and 
at Watchogue there are many hundred of each kind whose spe- 
% poe ‘ 
Our species in the sterile state may be recognized as follows : 
Thallus pubescent on both sides - costa covered on antical side by more than two 
‘ows of cells, M. pubescens. 
Thallus pubescent on postical side and at margins ; costa covered on antical side 
by two rows of cells, 
Costa covered on postical side by two rows of cells ; marginal hairs long, 
curved or hooked, M. hamata. 
Costa covered on postical side by three to six rows of cells. 
Thallus decurved ; marginal hairs in 2's or 3's, divergent. 
Thallus very narrow ; costa large ; hairs very abundant on costa and 
margins ; (dioicous), M. myriopoda, 
Thallus broader ; costa small; marginal hairs always twinned ; 
(autoicous), : M, conjugate. 
Thallus: plane ; marginal hairs not protruding ; lamina usually with 
M. furcata. 
Scattered hairs ; (dioicous), 
