n 
32G MOXOGEAPH OF THE LABOULBENIACE^. 
stalkj gradually expanding upward and characteristically constricted at the common septum. 
The species is most closely allied to L. elongata^ but is always readily separable from this 
species by the characters just mentioned. Although growing exposed to unfavorable conditions 
m 
istic of species developed in this position. 
Laboulbenia arcuata Thaxter. Plate XVII I, figs. 1-4. 
Proc. Am, Acad. Arts and Sci. Vol. XXIV, p. 2G8. 
Pcritlicciuin smoky-black, becoming uniformly almost opaque; large, narrowed somewhat 
towards tbc broad, bluntly rounded, less deeply colored tip, which is nearly symmetrical or bent 
slightly inward. Outer appendage consisting of a rather large basal cell, from whicli arise one, 
often two, branches, which may be simple or once or twice branched ; inner appendage arising 
from a much smaller basal cell, which produces two branches, simple or sparingly branched, 
bearing usually solitary anthcridia laterally. Receptacle at first colorless, contrasting with the 
dark perithecium ; but becoming shghtly suffused with brown, the ba^al cell usually larger than 
the sub-basal, and strongly curved. Spores, 65x5^. Pcrithccia, 160-185x50-65^. 
AppejKlages longer, 240 ^. Total length to tip of perithecium, 300-350 ^ ; average, 320 ^. 
Harp 
o 
Tliis well marked and rather rare species is readily distinguished by its peculiar perilhccltiin. 
.. ....... .. .a. a« X xiuve oDscrvea, only on th(f broad tips of the anterior pair of lens (usually 
the left) of male mdividuals, where it is sufficiently conspicuous from its contrasting colors. 
Though the abundant material obtained is all from New England, the species, togefhcr with the 
rema,„.„. fo.n.s which inhabit the same bost, are all doubtless widely distributed in the United 
Laboulbenia Harpau Thaxter. Plate XIV, figs. 15-18. 
Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 13. 
Hyaline, becoming tinged with brown. 
clearlv dist no-nf.]..^ °i , , ierithecmm small, inflated below, tapering to the 
alight, pointed .r^^^ZlT^t^^^'^'''^' T''' '' """^ '""' '''""'' '""" " 
usually somcvhat -oundcd basal H fl ''"'■ ""'""■ "^^'"'^""-^ ^""^'^'''"° °^ " 
branched, their branel.es t^^J^Z^^i^'T //"""f ™' ''"'''' " """ '" '^^ 
at the septa • innpr .nno. i -'^^J'^V^' ing, all the cells rather short, inflated and constricted 
tacle suh-r.vl,-nr7,.,-..T . ' ^.„. . o^^isually solitaij, lateral antheridia. Bn.snl cclhof the rcccj> 
tacle sub-cylindrical, commonly Ion. r than the ,1 V TT '".*''''''^^'^- ^''''^ ^^^^'^^ '^'^ ''''^'• 
the septum between the two Lrel fa b i T ' ''^^^ 
40.. Annn..i.„.„ ,.. more or less Oblique. Spores, 60-68 X 5-5.5 u. TWlfbonln nO x 
40 >t. Appendages longer, 200-300 ^. 
'^ Harpalus 
rcrithccia, 00 X 
(215-300 /i) 
'o 
its -all peri Za n I „" '""""'^'' '"" '"' °"-" "^^ "- P-uHarly n 
P thooium. It grows, appressod and densely crowded, invariabl/on 
)dificd tip of 
the antorior 
