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. 
Meet OLOGICAL: FOU LAA Les 
VoL. I. JUNE, 1890. = NO Se 
NOTES ON THE HETEROSPOROUS FERN ALLIES OF 
THE PACIFIC COAST AND MEXICO. 
BY LUCIEN M. UNDERWOOD. 
Recent collectors in western North America have contributed 
much to our knowledge of the distribution of the fern allies, and in 
order to further stimulate the search for these inconspicuous forms 
we present a list of the species represented in our herbarium, with 
their distribution as known at the present time. We reserve Se/ag- 
inella as the subject of a further paper. Of the others, /soe/es and 
Pilularia are least conspicuous and are very likely to be overlooked 
from the fact that their foliage bears a striking resemblance to sterile 
grasses, sedges or rushes (Juncus). Indeed, sterile stems of Eleo- 
charis and Juncus are frequently sent in for species of Pilularia and 
Jsoetes respectively. It is probable that both genera have a far wider 
range than is now known. AMarsi/ia,more conspicuous and attract- 
_ive, is more frequently collected; the same is true of 4zod/a, which 
forms a beautiful covering on the surface of many ponds and ditches. 
The following list includes all the species hitherto reported from 
the region covered; species not represented in our own collection are 
~ enclosed in brackets. 
IsOETES ECHINOSPORA Dur. var. To this variable species we 
have referred two specimens collected by Prof. Macoun on Vancou- 
ver Island, although both differ somewhat from each other and from — 
any of the described forms of this species: Sproat Lake, 1887; flow- 
ing water between tides, Alberni, 1887 (Macoun). ie: 
_ [IsorTes pyGmaa Engelm. So far as we know the only speci- oe 
mens yet found are those of Bolander’s original collection (1866) in 
‘‘a cold Alpine stream on the eastern ‘slope of the Mono tesa Cali- ae 
fornia, 7000 ft alt. te 
at We 
. 
. a  PiBpehnaant The Genus luiseten § in North heehee Trans. St Louis Acad. 1. Sei, De 
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