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i8o FERNS OF NORTH AMERICA.
pear that Milde is right in making A . Boottii and A . remo-
him both hybrids of A . spinutosum, the one with A . cristahnn,
the other with A . Fitixnnas.
For the form here described the specific name Boottii is
-several years older than uliginosum, for though the Aspidium
spimdosum var. lUiginosum of Braun was published in 1843,
yet Milde positively asserts that the plant so named belongs
to the true A . spinidosum, and in no way to Newman’s var.
idiginosum, the date of which is somewhere between 1849
and 1851.
Plate L X IX .— Aspidium Boottii, a rather small fertile frond from
near Boston. Fig. 2 is a fertile pinnule from one of the middle pinnæ,
and Fig. 3 is a sterile pinnule from one of the lower pinnæ, both
somewhat enlarged. Fig. 4, an indusium. Fig. 5, a spore, and Fig. 6,
a section of the stalk.
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