230 THE BOULDER FERN. 
wh Occasionally it is slightly 
be narrowed below. It is 
twice pinnate, the primary 
pinne being oblong-lanceo- 
late and the secondary oblong- 
ovate, deeply lobed and the lobes 
again toothed. The stipes area 
shining chestnut-brown and about 
half the length of the fronds. 
There is not much difference in 
the appearance of fertile and ster- 
ile fronds ; indeed the sori are so 
inconspicuous that one has to 
we” look rather closely to see them 
at all and a magnifier is required 
to satisfactorily make out their 
parts. They are mostly situated 
on the outer margins of the pin- 
nules at the base of the segments. 
The indusium is fixed under the spor- 
angia and is held by a reflexed tooth 
of the segment. Under a lens it 
looks like a tiny green cup filled with 
round spore-cases. The fronds are 
minutely glandular-hairy and when 
bruised in the hand give off a strong, 
ae sweetish fragrance. The odour is 
“ppg eS” very noticeable in the drying plants. 
oad During the haying season, whole 
} BOULDER COunties in eastern Pennsylvania are 
Dukes thoroughly perfumed by the fronds 
Prostascul@ oe with the hay. 
Among its common names are fine-haired 
