— 91 — 
P. frondifera Merrill sp. nov. 
Reaction Kt, me. C — 
Thallus cartilagineous, orbicular, somewhat expanded, decumbent, 
testaceous at the circumference but cinereo-glaucous centrally, lobate- 
laciniate and profoundly divided, but confusedly plicate and sub-imbricate 
centrally, margins crenulate or broadly crenate at periphery, but centrally 
more divided and even fimbriate and here together with the surface of the 
thallus beset more or less with reduced fimbriate lobules; the upper surface 
opaque, confusedly rugulose, and here and there ruptured forming verrucae, 
these white -sorediate-punctate; within white; below black and rhizinose at 
the centre, pale with concolorous rhizinae at the circumference. Apothecia 
short pedicellate, cup-shaped, rather large, the disk light-chestnut 
and bordered by an incurved, radiately rugose and sometimes fis- 
sured exciple, this similarly punctate-soredjate with the thallus. Spores 
oblong- ellipsoid - A 0 /j.. 
On cedar bark, No. 3627, Peele Point, Ont. J. Macoun. 
Very near P. dubia and P. rudecta but separated by lack of reaction 
with C, the lobulate upper surface and its smaller spores. 
Comparable with P. reddenda Stirton in lack of reaction. The curious 
fact may here be noted that nearly all lichenists at some time examine speci- 
mens of P. dubia and P. rudecta which fail to afford its characteristic 
reaction with C. Nylander himself had this experience, but offered no ex- 
planation. All specimens of the two species in our own herbarium with 
one exception respond to the reagent, and that is a normal P. rudecta 
Three specimens of P . frondifera from widely separated localities, Ontaria, 
New York and Florida are me. C — , and it seems not to be an accidental 
negative. 
P. ulophylla (Ach.) Merrill. 
P. caperata var. ulophylla Ach. Lich. Univ. p. 458. 
Reaction KI, C+ bright rose, me. K(C)-f- rose, but evanescent; soredia 
tinged red by C. 
Thallus cartilagineous, broadly expanded, decumbent, orbicular, ochro- 
leucous or greenish-ochroleucous, lobate-laciniate at the circumference, but 
the laciniae coalescing centrally, the margins cut-crenate at the periphery, 
but sinuous, elevated and invested with conspicuous sub globose or limbate, 
granulate or sometimes farinose soredia at the centre, these here and there 
running together and forming a crust; above opaque, or shining at the cir- 
cumference, confusedly rugulose, the cortex sometimes here and there rimose 
or punctate-ruptured producing white soredia; within white; below black 
and opaque at the centre, shining and brownish at the periphery, with few 
and scattered rhizinae. Apothecia short-pedicellate, moderate, the disk 
chestnut, bordered by an incurved, slightly crenate exteriorly sorediate exci- 
ple. Spores ellipsoid, 1 s ‘ 7 5 _~ ' -- ju. 
On trunks, No. 734, Manitoba House, Man. J. Macoun. 
This plant has been variously called P. caperata var. ulophylla Ach. 
Lich. Univ. p. 458. P. rudecta var. ulophylla Ach. Synopsis p. 197. and P. 
Borreri var. ulophylla Nyl. and Hue. It is probable that this is the plant 
