280 Rhodora [NovEMBER 
Associated with both of these at their various stations, but occupy- 
ing an intermediate zone on the shore, 7. e. lower down than the lat- 
ter, but higher up than the former, is a large species, often with 
80 to 100 reddish leaves from 10 to 15 inches long, with the appear- 
ance of 7. Gravesii, A. A. Eaton or Z. Zatoni, Dodge, the sporangia 
being darker than in those, but very flaccid owing to the compara- 
tively few spores they bear. A careful study has convinced me how- 
ever, that its affinities are really with Z. foveolata, A. A. Eaton, from 
which it differs principally in the spores. In that species they have 
a generally immature appearance, and occasionally there is a spore 
that is covered with open, thin-walled reticulations. In this, all the 
spores are well formed and irregularly honeycomb-reticulated, simi- 
larly to those of Z. riparia. "This may be known as 
I. FoveoLaTa, var. plenospora. Trunks bilobed, 1—2 cm. in long 
diameter, half as wide and one fourth as high; the bulb of sporanges 
1—4 cm. in diameter: leaves 30-110, submersed, reddish or olive 
green, 1.5 mm. in diameter or more, 20-40 cm. long, fleshy, spread- 
ing, somewhat flexuous, the emersed light green, erect tortuous or 
straight, finely pointed, 1 mm. diameter, all with stomata but no bast- 
bundles: velum 1-4 indusiate, sporangia very thickly covered with 
rather dark brown cells, the color showing through the very thin 
“area” on the back of the leaf-base: gynospores rather few to each 
sporangium, usually somewhat glaucous, 450—600 p, average 510 p in 
diameter, covered with irregular, tall, thin, rough, mostly honeycomb- 
reticulated walls: androsporangia scarce in early season, plentiful in 
September, the spores 27-33 mw in diameter, very finely granular or 
with occasional tubercles. 
In aspect this variety appears like an overgrown Z. Zuckermanni, 
the habit and color being similar. By spore-characters alone it 
could not be easily separated from the last, nor indeed from several 
of our reticulate spored species. ‘The reddish color of the leaves 
appears always to be present, becoming brownish in dried plants. 
It is more pronounced in the inner leaves, fading as they grow older. 
Ames Pond, North Easton, Winneconnet Pond, Norton, . and 
Watson's Pond, Taunton, 4. A. Zaton, scattered rather thinly in silt- 
covered gravel or in mud where emersed for part of the summer. 
Types from these localities collected by A. 4. Eaton, 1903. 
AMEs BOTANICAL LABORATORY, North Easton, Massachusetts. 
Vol. 5, no. 58, including pages 237 to 260, was issued 13 October, 1903. 
