IS'ifi.] 
TFIE NORTH AMERIC^iN HYPO ORE ACEA3. 
84. Polystigma rubku^i (Peks.), D. C. 
( Xyloma rubrum^ Pers. Syn., 105; Dothidia rubra (Pers. ), Fr. 
S. M., 558.) llypophyllous, suborbicular, slightly convex, 2 — 4 
millim. across, with an even margin, red, at length darker; per- 
ithecia (cells) small, immersed, reddish; ostiola impressed, puncti- 
form, becoming more prominent; asci clavate, 8-spored; sporidia 
ovoid, snbobtnse, straight, snbhyaline, 10 x 0 y. The spermogonial stage 
is Libertelki rubra, Bon. Spermatia filiform, uncinate, 80 y long. On 
living leaves of several species of Frunus [F, domestica, F. spinosa). In 
Saccardo’s Sylloge, the species is credited to this country, bilt we are not 
aw are by wdiom or where collected. 
85. Polystigma (?) Bijmelia2, Schw\ 
( Dothidea Bumelioe, Schw. Syn., N. Am., No. 1884.) Epiphyl- 
lous on living leaves of Bumelia oblongifoUa, found in the Arkan¬ 
sas region by NTuttall. Stroma orbicular, large f cm. and over, ovate 
or of somewhat irregular shape, conspicuous on both sides of the leaf, 
on the upper side brick-red and somewhat shining as if varnished, paler 
and without any varnished appearance below; perithecia (cells) few, 
scattered, minutely pseudo-ostiolate and subprominent. 
Gen. VII, Nectria, Fries — Perithecia carnose-membranaceous, 
mostly bright colored, ciespitose and generally seated on a subcarnose 
stroma (tubercularia); sporidia oblong or fusoid, hyaline. 
A. Sporidia continuous. 
* Asci polysporous [Chilonectria). 
8B. Nectria cuctjrbitula, Curr. 
Perithecia cjespitose, orange-red, nearly smooth, at length col¬ 
lapsing ; ostiolum papilliform, minute ; asci clavate-cylindiical, 75—100 
X 10—12 y, filled with countless minute sporidia, 2—8 ( mostly 24 y ) 
X 1—U- /^. In the early stages of growTh, the asci contain 2—4 cylin¬ 
drical bodies about 8 y thick and varying in length from 15 y to 
nearly the entire length of the asci. Tliese elongated bodies are 
subundulate and often appear distinctly multiseptate with the septa 
either running square across or with their ends a little curved so as to 
give the appearance of a series of hyaline, subglobose sporidia, but 
finally these cylindrical bodies are filled wdth the minute sporidia, w'hich 
at length fill the entire cavity of the asci. Sometimes, instead of the 
elongated bodies, some of the asci will be seen to contain one or twm 
series of faintly-outlined, subglobose cell's, which, aiso, are at length 
filled with the minute sporidia and disappear. The peculiarity here 
noted has been observed in all the specimens on coniferous trees thus 
far examined and w'e fancy w’e see the same structure in the N. cucurbi- 
tula, issued by Fries in his Sclor. Suec., wdiich w^e have had the opportu¬ 
nity of examining. On Finns riyida and F. strobus, New'field, N. J., and 
on Abies balsamea. West Chester, Pa. According to Saccardo, in Syll- 
oge, found also on various deciduous trees. 
