376 BICKNELL: FERNS AND 
tucket, in Squam, measured forty-two inches in maximum girth. 
But much stouter trees grow on Tuckernuck where trunks were 
measured forty-seven and fifty inches and one sixty-eight inches 
in circumference about one foot above the ground, decreasing to 
forty-five inches a span higher up. 
Quercus stellata Wang. New stations are Acquidness Point, 
a close group of five trees, the largest eight feet high (1911) and 
near Wigwam Ponds, four scattered trees from four to seven feet 
high (1912). 
Quercus pagodaefolia (Elliot) Ashe. On June 9, 1911, the oak 
tree discussed in Part IV under this name was found to be dead, 
but a second and perfectly healthy tree of about the same height, 
and twenty-five inches in girth of trunk near the base, was dis- 
covered not far off in the same thicket. Some old acorn cups 
found beneath the tree are saucer-shaped to hemispheric, some of 
then contracted to a short scaly base, 1.5-3 cm. wide, the slightly 
tomentulose scales closely imbricated to a firm margin, the indi- 
vidual scales contracted to a lanceolate obtuse termination. A 
few partly decayed nuts were ovoid-globose, the exposed portion 
apparently about one half their length. 
Quercus ilicifolia Wang. Two forms of the bear oak differing 
markedly in leaf pattern are common on Nantucket. In char- 
acteristic form the leaf of this oak has short lobes of more or less 
triangular general outline. In the variant the lobes of the leaves 
are narrower and more tapering, becoming lanceolate or even 
somewhat falcate, the sinuses cut much nearer to the midrib and 
the terminal lobe often elongated after the manner of Q. falcata 
Michx. Some leaves indeed are strikingly similar to those of that 
species. The two forms of leaf present extremes of divergence 
that are very noteworthy and suggest an Sree subject for 
critical study. 
Quercus rufescens (Rehder) sp. nov. 
Quercus prinoides var. rufescens Rehder, Rhodora 9: 60. 1907. 
This scrub oak proves to maintain so notable a constancy in its 
characters and is so readily recognizable that, as a result of field 
observations both on Nantucket and on Long Island I have come 
