24 NORTH AMERICAN FLORA [VoLumE 3 
perithecia superficial, solitary or more or less crowded, small, averaging about 2004 in 
diameter, smooth or nearly so, globose, with a rather prominent papilliform ostiolum, be- 
coming slightly collapsed from above when dry; asci clavate, 40-50 * 6-7, 8-spored ; 
spores 1-2-seriate, mostly 2-seriate above and 1-seriate below, usually a little broader above, 
fusoid, 1-septate and a little constricted at the septum, with small oil-drops in each cell, 
8-11 K 3-44. 
On dead stems of Urtica sp., more rarely on old branches and dung. 
TYPE LOCALITY : Germany. 
DISTRIBUTION: North Dakota; also in Europe. 
ILLUSTRATION: Mycologia 1: pl. 13, f. 8-10. 
EXSICCATI: Wilson & Seaver, ‘Ascom. 79. 
16. MACBRIDELLA Seaver, Mycologia 1: 195. 1909. 
Perithecia in dense, cespitose clusters seated on a stroma, bright-colored, reddish or 
yellowish, becoming darker with age, globose to subcylindric, collapsing or entire; asci 
cylindric-clavate, 8-spored ; spores ellipsoid or fusoid, 1-septate, at first hyaline, becoming 
smoky-brown to brownish-black. 
Type species, Nectria chactostroma Ellis & Macbr. 
Spores striately marked. 
Spores 35-48 x 10-12 yu. 1. M. striispora. 
Spores 15 x 5-6 #. 2. M. olivacea, 
Spores not striately marked. 3. M. chaetostroma. 
1. Macbridella striispora (Ellis & Ev.) Seaver, 
Mycologia 1: 196. 1909. 
Nectria striispora Ellis & Ev.; C. L. Smith, Bull. Lab. Nat. Hist. Univ. Iowa 2: 398. 1893. 
Perithecia in irregular, dense, cespitose clusters as large as 5 mm. in diameter, consist- 
ing of 20-100 perithecia each ; individual perithecia subcylindric, tapering above into an obtuse 
ostiolum which in mature specimens is quite prominent, at first covered with a yellowish- 
furfuraceous coat, finally amber ; asci clavate, tapering above, about 100 x15“; spores 
crowded in the ascus, large, fusoid, straight or curved, 1-septate, with several large oil- 
drops in each cell, slightly constricted at the septum, pale-brown, becoming striate, 35-48 
X 10-12 » ; paraphyses indistinct. 
On bark and rotten wood. 
TYPE LOCALITY : Castillo Viejo, Nicaragua. 
DISTRIBUTION : Known only from the type locality. 
ExsiccaTi: C. L. Smith, Central Am. Fungi 6. 
2. Macbridella olivacea Seaver, Mycologia 2: 178. 1910. 
Stromata gregarious or crowded, tubercular in form, 0.5-1 mm. in diameter, externally 
floccose, pink ; conidiophores verticillately branched, about 1504 in length with a chain of 
conidia at the end of each branch; conidia ellipsoid, simple, about 35; perithecial 
clusters gregarious or crowded, each containing from 15~25 perithecia ; individual perithecia 
at first covered with coarse, olivaceous granules, becoming smooth or minutely roughened, 
dark-colored, brownish-olivaceous, ovoid; asci cylindric or slightly clavate, about 100 
long ; spores obliquely 1-seriate or slightly crowded in the upper part of the ascus, at first 
fusiform and hyaline, with several oil-drops, and surrounded by a hyaline membrane, 
becoming l-septate, at maturity fusoid or subellipsoid, 1-septate, and slightly constricted 
at the septum, olivaceous to brown, with an oil-drop in each cell, externally becoming rough- 
ened ; roughenings appearing as coarse, longitudinal or spirally arranged striations, 155-64. 
On palm stems. 
TYPE LOCALITY : Motzorongo, Veracruz. 
DISTRIBUTION: Known only from the type ae 
ILLUSTRATION : Mycologia 2: pl. 30, f. 6-. 
3. Macbridella chaetostroma (Ellis & Macbr.) Seaver, 
Mycologia 1: 195. 1909. 
Nectria chaetostroma Ellis & Macbr.; Ellis & Ev. Bull. Lab. Nat. Hist. Univ. lowa4: 70. 1896. 
Perithecia in dense irregular clusters 1-5 mm. in diameter, clusters often elongate ; 
individ al p rithecia globose or subglobose, dark reddish-brown, becoming brownish-black, 
