MICHIGAN ACADEMY OF SCIENCE. 
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(E) Peris poriales. 
E. Peritkecia closed, with appendages: (a) Erysibaceae. 
E. Peritkecia without appendages : 
(Not included) (b) Microthyriaceae. 
( c ) Perisp oriaceae. 
(a) Erysibaceae. 
1. Appendages needle-like, enlarged at base: Phyllactinia. 
1. Appendages hooked or coiled at their apex: ’ Uneimila. 
1. Appendages dichotomous at the apex: (2) 
1. Appendages variously shaped: (3) 
2. Peritkecia containing only one ascus : Podosphaera. 
2. Peritkecia containing several asci : Microsphaera. 
3. Peritkecia containing only one ascus: Ephaerotheca. 
3. Peritkecia containing several asci : Erysibe. 
(F) Hypocreales. 
Hypocreaceae. 
1. 
1 . 
2 
o 
o 
— 1 . 
3. 
3. 
4. 
4. 
5. 
0. 
6 . 
6 . 
i . 
Spores hyaline : (2) 
Spores brown or dark-colored (7) 
Spores elliptical, 2-celled: (3) 
Spores elliptical or elongated-fusiform; 3-many celled: Calonectria. 
Spores needle or thread-shaped; perithecia on a stroma: (5) 
Perithecia on a loose mvcelioid stroma; growing on old Agarics, etc.: 
Hypomyces. 
Perithecia not on decaying fungi: (4) 
Perithecia imbedded in a cushion-shaped or effused stroma; the 2 
cells falling apart at maturity: Hypocrea. 
Perithecia on top of the stroma, or stroma lacking; spores often form- 
ing numerous conidia in the Ascus: Nectria. 
Stroma erect, growing from dead insects or larvae or “Tubers” hidden 
in the ground or wood: Cordyceps. 
Not on insects or “Tubers:” (6) 
Infecting grains of rye and other grasses, which it causes to en- 
large and turn blackish (Sclerotia) : Claviceps. 
Forming thin stromata around plant stems: Epicliloe. 
Spores spherical; causing a dangerous wilt-disease of Cotton, Cow- 
pea and Watermelon, by the mycelium filling vascular system: 
Necosmospora. 
Spores muriform (i. e. divided like a brick wall) : Pleonectria. 
