Seaver: The Hypocreales of North America 195 



17. Macbridella gen. nov. 



Perithecia in dense cespitose clusters seated on a stroma, bright 

 colored, reddish or yellowish, becoming darker with age, globose 

 to subcylindrical, collapsing or entire ; asci cylindrical-clavate, 

 8-spored; spores elliptical or fusoid, i-septate, at first hyaline, 

 becoming smoky-brown to brownish-black. 



Type species : Nectria chaetostroma Ellis & Macbr. 



Distinguished from Creonectria by the colored spores. The 

 subgeneric name Phaeonectria was proposed by Saccardo and 

 based on one of the species here described. Since both of the 

 North American species included in this genus were collected on 

 a botanical expedition sent out from the State University of Iowa, 

 both were originally described in the Bulletin of the Laboratories 

 of Natural History of that Institution, and the type of the genus 

 bears the name of Professor T. H. Macbride as its coauthor, it 

 seems appropriate that the genus should be named in his honor. 



Spores small, 18-20 X 7-8.5 mic. ; perithecia sur- 

 rounded with hairs. 1. M. chaetostroma. 



Spores large, 35-48 X 10-12 mic.; perithecia not 



surrounded with hairs. 2. M. striispora 



i. Macbridella chaetostroma (Ellis & Macbr.) 

 Nectria chaetostroma Ellis & Macbr. ; Ellis & Everh. ; Bull. Lab. 

 Nat. Hist. St. Univ. Iowa 4: 70. 1896. 



Perithecia in dense irregular clusters 1-5 mm. in diameter, 

 clusters often elongated ; individual perithecia globose or sub- 

 globose, dark reddish-brown, becoming brownish-black, slightly 

 collapsing becoming pezizoid, surrounded at the base with a 

 growth of brown, crooked, septate hairs, 100-200 mic. long and 

 3-4 mic. thick; asci clavate, 75-80 X 10 mic, 8-spored; spores 

 2-seriate or rather irregularly crowded in the ascus, elliptical, 

 straight or curved, i-septate, slightly constricted, with a distinct 

 oil-drop in each cell, pale brown, 18-20 X 7-8.5 mic. ; paraphyses 

 filiform. 



On bark of undetermined tree or shrub. 



Type locality: Central America. 



Distribution : Known only from type locality. 



Exsiccati: C. L. Smith, Nicaragua Fungi, 206 (cotype). 



" The first appearance is a tuft of dark brown hairs, which are 

 finally hidden and almost obliterated by the densely crowded 

 perithecia 10-40 in number in a compact group 1-4 mm. across." 



