506 HowE: PHYCOLOGICAL STUDIES 
Fauchea Sefferi sp. nov. 
Thallus moderately thin (30-80u) and cartilaginous-mem- 
branaceous when dry, cartilaginous and 135-320 thick when moist, 
cespitose-ascending(?), dichotomous, mostly 6-11 times forked, 
spreading 7-12 cm., axils rounded or subacute, segments linear, 
I-2.5 mm. wide, nearly uniform in width throughout or slightly 
wider under the dichotomies, rarely concrescent, margins entire 
(except for cystocarps), the terminal segments tapering, obtuse 
or subacute, somewhat divaricate or patent; color a dull brownish 
red; medullary layer of 2-6 irregular series of large elongate 
nearly empty cells, these often irregularly compressed and folded, 
55-137H X 22-55m in cross section (or reaching 240 X 110 in 
basal parts), with occasional small interstitial cells, passing rather 
abruptly to the subcortical layer of I-3 series of smaller thick- 
walled cells; cortical layer composed of distinct anticlinal rows 
of 4-8 series of minute cells, these 3-9u high, walls of cortical 
cells soft, gelatinous, and confluent: cystocarps marginal, sessile, 
nearly spherical, obovoid, or hemispherical, 0.5-0.95 mm. i 
diameter. [PLATE 31.] 
La Paz, Vives rre. 
Fauchea Sefferi is in a way intermediate between the Medi- 
terranean F. repens (Ag.) Mont. and the Californian and possibly 
northern F. laciniata J. Ag., but is amply distinct from both. 
From Fauchea repens it differs in the evidently non-repent habit 
of growth, in the thin and less cartilaginous thallus, in the narrower 
segments (I-2.5 mm. vs. 2-8 mm.), in the smaller, more gelat- 
inous-walled, more irregularly compressed and often folded cells 
of the medulla, in the occurrence of occasional small interstitial 
cells among the large cells, and in the more globose sessile cysto- 
carps. From Fauchea laciniata, F. Sefferi differs in the dichot- 
omous instead of palmate-laciniate mode of branching, in having 
the principal segments narrower (often 1 cm. or more broad in 
F. laciniata) and linear rather than cuneate, in the smaller strictly 
marginal and non-coronate cystocarps, in the more gelatinous 
cell walls, the usually more compressed cells of the medulla, etc. 
The specimens, dried under pressure, adhere fairly well to 
paper except in the older parts. 
This species is dedicated to the memory of the late Dr. Pehr 
Olsson-Seffer, editor of the American Review of Tropical Agri- 
culture and professor of botany in the new Mexican University, 
