HYSTEROGRAPHIUM. 



233 



Eostrup^ regards it as a parasite on Fraxinus. Twigs of the 

 ash attacked show flat collapsed plates of bark, ou which are 

 developed pycnidia containing one-celled conidia, and, later, 

 the apothecia. On young twigs the diseased, part often extends 

 round the whole circumference, and causes the death of tlie 

 upper living part. As yet I have only found tliis fungus as 

 a saprophyte, 



HYPODERMIEAE. 



Hypoderma. 



The apothecia are oblong, and at tirst closed by a thin black 

 cover, which opens by a long fissure. The asci are sessile in 



Fig. lit". — Hijpoderma strobicota on Pinvs 

 Strobus. Ascus containing eight ascospores 

 with gelatinous coats ; paraphyses with 

 clavate ends. (After v. Tubeuf.) 



Fig. 117. — Hirtxxitrnia Dlrobicolo. Isolated 

 ascospores : with and without a gelatinous 

 coat, and one- or two-celled, (.\fter v. 

 Tubeuf.) 



some species, but have a delicate stalk in others. The spore.s, 

 eight in each ascus, are never long and thread-like, but always 

 much shorter than the asci, and two-celled when mature. The 

 paraphyses have button-shaped or hooked ends. 



Hypoderma strobicola- (Rostr.). Needle-blight of the Wey- 



' Rostiup, Forf.iatte l7nder.^oe(jelser ov. SnyUesvampeH Angreb pan Skor- 

 traeerne, 1883. 



-Rostrup, Forfmfte Under soegelser, 1883. 

 V. Tubeuf, Bait. -;. Kenutniss d. Baumtrankheifeu, 1888 ; also Bolaii. 

 Centralhlatt, XLi,, 1890. 



Note : When I decided to place Lophoderminm hrachy>iporum under the 

 genus Hypoderma, there already existed a Hypoderma hrachysporam Speg. 

 (1887). For the future I shall therefore call Loph. hrarhyxponim Rostr. a.s 

 Hypoderma strobicola. 



