FERNS. Tal 
Alsophila: Fruitmasses dorsal, roundish. Involucre absent. 
Receptacle elevated. 
Polypodium: Fruitmasses dorsal, roundish. Involucre ab- 
sent. Receptacle depressed. 
Hypolepis: Fruitmasses marginal, roundish. Involucre uni- 
valved, reflexed. Receptacle depressed. 
Davallia: Fruitmasses marginal, roundish or elongated. In- 
volucre univalved or cylindrical. Receptacle depressed. 
Cheilanthes: Fruitmasses marginal, confluent. Involucre 
lobed or imperfect, reflexed, hardly defined. 
Notholena: Fruitmasses marginal, confluent. Involucre 
formed by the reflexed margin of the frond or obliterated. 
Adiantum: Fruitmasses marginal, short, distinct, rarely con- 
fluent. Involucre formed by the reflexed margin of the frond, 
well defined. 
Lindsaya: Fruitmasses marginal, linear. Involucre linear, 
opening outward. 
Pieris: Fruitmasses marginal, linear. Involucre linear, open- 
ing inward. 
Lomaria: Fruitmasses linear, on the underside of contracted 
separate fronds. Involucre linear, opening inward. 
Blechnum: Fruitmasses dorsal, linear, along the midrib of 
the unchanged frond. Involucre linear, opening inward. 
Doodia: Fruitmasses dorsal, linear or elongated, along or 
near the midrid of the unchanged frond. Involucre confluent or 
univalvular, opening inward. 
Asplenium: Fruitmasses dorsal, elongated or linear, dispersed. 
Involucre linear or narrow, opening on one side. 
Aspidium: Fruitmasses dorsal, roundish. Involucre free, 
except at the point of insertion. 
Grammitis: Fruitmasses dorsal, linear or elongated. Invo- 
lucre absent. 
I].—HyYMENOPHYLLEZ. 
Trichomanes : Involucre tubular. Fruit-axis hairlike, exserted. 
Hymenophyllum: Tnvolucre bivalved. Fruit-axis generally 
enclosed. 
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