530 Seaver : Some North Dakota Hypocreales 



Nectria purpurea (L.) Wilson & Seaver. 

 Nectria cinnabari7ia (Tode) Fries. 



On dead branches of various kinds of trees and shrubs. The 

 mature fruit of this plant occurs on dead branches and usually in 

 great abundance, but its conidial phase is reported to be parasitic. 

 The species is recognized by the rough perithecia, which vary in 

 color from rather bright cinnabar-red to dull brownish black and 

 are borne in dense clusters on a tubercular stroma. 



Nectria verrucosa (Schwein.) Sacc. On dead branches in 

 woods near Fargo. The perithecia and spores of this species are 

 identical with those of the preceding. The species is distinguished 

 by the fact that the stroma is depressed, never rising above the 

 surface of the bark, while in the preceding it is tubercular and very 

 prominent. 



Nectria tuberculariformis (Rehm) Winter; Rabenh. Krypt. 

 Flora I": ii8, 119. 1887. 



Hypocrea tubercidainformis Rehm, Ber. Naturh. Ver. 

 Augsburg 26: 106. 1881. 



Exsicc. : Rehm, Ascom. ^J5, 6jg. 



Other specimens examined : N. Dakota, Seaver, various col- 

 lections. 



Habitat : Herbaceous stems (especially Urtica sp.), bark, and 

 dung. 



Stroma tubercular, rounded or more usually elongated, nearly 

 smooth or in dried specimens often longitudinally striated, pinkish 

 or rose-colored, becoming dull red with age. 



Perithecia superficial, solitary or more or less crowded, small, 

 averaging about 200/^ in diameter, smooth or nearly so, globose 

 with a rather prominent ostiolum, delicately rose-colored, becom- 

 ing slightly collapsed from above when dry ; asci clavate, 8- 

 spored, about 40-50 /.< X ^-7 !^; spores i - or 2-seriate, mostly 2-se- 

 riate above and i -seriate below, usually a little broader above, 

 fusoid, and a little constricted at the septum, with two or more 

 small oil-drops in each cell, 8-1 1 [i X 3-4/^- 



The conidial phase is often very abundant but the mature fruit 

 is less common. 



HI. Pleonectria 



Pleonectria berolinensis Sacc. On dead branches of red 

 currant in the Agricultural College Gardens and also on branches 



