a a 
PLEURAGE 71 
our knowledge of the group is based on Woronin’s * investigations 
of this species. It is one of the largest plants of the genus and 
one of only two or three in the whole family in which conidia 
have been actually found. It is also one of the few species of the 
family that have thick leathery perithecia. Woronin distinguishes 
three distinct layers of tissue aggregating about ten cells in thick- 
ness. 
Dry specimens behave rather peculiarly when soaked in water 
or caustic potash preparatory to mounting. After remaining in 
the water for an hour or longer, the outside tissue of the perithe- 
cium swells to a considerable extent, and may be removed by 
gentle agitation of water or by dissection with needles, without 
interfering with the inner layers or their contents in the least. 
(See also under Sordaria bombardioides.) 
12. Pleurage erostrata sp. nov. 
Perithecia scattered and entirely superficial, 180-225 ۸ in 
diameter, thin membranaceous, ranging from hyaline when young 
through greenish to black and opaque, completely covered with 
long flexuous septate brown hairs, spherical, with no beak and 
eae no ostiolum. 
Asci 8-spored, clavate, rounded above and contracted below 
.into a short mr base, very evanescent, 16-21 ux 48-54 ft: 
paraphyses absen 
pores P uh: ellipsoid to ovate, acutely rounded above and 
broadly rounded to truncate below, ranging from hyaline when 
young through olivaceous to dad. brown and opaque, 6.5-8 u 
x 11-13 زم‎ primary appendage rather shorter than the spore, 
cylindrical, straight, both this and the apex of the spore tipped 
with short very evanescent gelatinous awl-shaped appendages. 
(Pl. 4. f. 11-13.) 
Distinctive character : Globular hairy perithecia. 
Cultivated specimens: On horse dung, Aberdeen, S. D., Oct. 
1895 ; horse, cow, and rabbit dung, Tucson, Ariz., Jan. 1900 (Ty- 
ler); cow dung, Rooks Co., Kan., July 1899 (Bartholomew); cow 
and sheep dung, Austin, Texas, Jan. 1900 (Long); horse dung, 
Summit, Mont., Aug. 1900 (Griffiths & Lange). 
It will be seen from the description of the perithecium given 
above that this species in some particulars resembles the Perzspo- 
* Abhand. Senckenberg. Gesell. (Frankfort) 1869. y 
