Family 1. NECTRIACEAE 
By FRED Jay SEAVER 
Perithecia entirely free on the substratum (occasionally subepidermal), or 
seated on a fleshy or tubercular stroma, but when the latter is present, perithecia 
always superficial, usually in cespitose clusters. Stromata often obscured at 
maturity by the perithecia and occasionally becoming obsolete in aged speci- 
mens, but in such cases their presence is indicated by the densely cespitose clus- 
ters of perithecia. 
Stromata and stromatic base entirely wanting. Tribe 1. NECTRIEAE. 
Stromata or stromatic base present; perithecia superficial. Tribe 2. CREONECTRIEAE. 
Tribe 1. Necrrreak. Perithecia free (without stroma) and occurring singly but often grega- 
rious and occasionally more or less crowded on the surface of the substratum, or formed beneath 
the epidermis and becoming erumpent-superficial, smooth, verrucose, or clothed with deciduous 
mycelial threads or well-developed hairs; asci cylindric to clavate or subovoid, 4-8-spored; spores 
simple or compound, globose to filiform, hyaline or colored; conidial phase never forming a 
stroma. 
Spores hyaline. 
Perithecia subepidermal, becoming erumpent-superficial. 
Spores simple. 1. HYPONECTRIA. 
Spores septate. 2. NECTRIELLA. 
Perithecia superficial on the substratum. 
Spores simple. 
Spores appendiculate ; perithecia beaked. 3. ELEUTHROMYCES, 
Spores without appendages; perithecia not beaked. 4. PSEUDONECTRIA. 
Spores compound, 1-many-septate. 
Spores 1-septate. 5. NECTRIA. 
Spores more than 1-septate. 
Perithecia light-colored: yellow or red. 
Spores ellipsoid to fusiform. 6. CALONECTRIA. 
Spores filiform or subfiliform. 7. OPHIONECTRIA. 
Perithecia dark-colored: blue. 17, GIBBERELLA. 
Spores dark-colored (brown or blackish). 
Spores simple. 
Spores subglobose, rough ; perithecia subglobose. 14. NEOCOSMOSPORA. 
Spores ellipsoid, smooth; perithecia flask-shaped. 8. MELANOSPORA. 
Spores compound, 1-septate. ‘ 9. LETENDRAEA. 
Tribe 2. CREONECTRIEAE. Conidial phase profuse, giving tise to stromata producing at 
first conidiophores and conidia, later perithecia; stromata fleshy, depressed, tubercular, or stalked; 
conidia variable; perithecia seated on, or surrounding, the stromata, usually in dense, cespitose 
clusters or occasionally scattered, but always entirely superficial ; perithecia, asci, and spores as in 
Nectrieae. 
Stromata upright, stalked, surrounded at the base by the cespitose 
perithecia. 
Spores 1-septate. 10. SPHAEROSTILBE. 
Spores muriform. 11. MEGALONECTRIA. 
Stromata depressed or tubercular, often concealed at maturity by the 
perithecia. 
Spores simple. 
Spores hyaline. 12, ALLANTONECTRIA. 
Spores brown. 
Spores ellipsoid, smooth. 13. SPHAERODERMATELLA. 
Spores subglobose, rough. 14. NEOCOSMOSPORA. 
Spores compound. 
Spores 1-septate. 
Spores hyaline. 15. CREONECTRIA. 
Spores brown. 16. MACBRIDELLA, 
Spores more than 1-septate. F 
Perithecia dark-blue (black to naked eye). 17. GIBBERELLA. 
Perithecia bright-colored (red, yellow, etc.) 
Perithecia cespitose on a depressed stroma. 18. SCOLECONECTRIA. 
VoLumE 3, Part 1, 1910] 3 
