Family 3. AECIDIACEAE 
By JosEPH CHARLES ARTHUR 
Basidia external. Telia usually erumpent, solid or pulverulent; telio- 
spores fascicled or free, pedicelled, wall firm, or with an outer gelatinous 
layer, overlaid by cuticle. 
Pyenia and other sori originating beneath the cuticle or between the epidermis and mesophy] ; 
telia erumpent, teliospores with fascicled or simple pedicels, wall firm, pores one in a cell 
and apical; aecia when present with peridium rupturing at apex, or without peridium ; ure- 
dinia when present without peridium or encircling paraphyses, spores usually darker and 
thicker above, borne singly on pedicels, sometimes with paraphyses intermixed. Subfamily 
RAVENELIATAE. 
Teliospores united into a head on a compound pedicel. 
Life-cycle with all spore-forms. 1. NEORAVENELIA. 
Life-cycle with pycnia, aecia and telia. 2. CYSTINGOPHORA. 
Life-cycle with pycnia, uredinia and telia. 3. RAVENELIA. 
Life-cycle with pycnia and telia. 4, DENDROECIA. 
Teliospores free, one to four on a simple pedicel, all but one lateral. 
Teliospores flattened laterally. 5 
Teliospores flattened above and below. 
Life-cycle with pycnia, uredinia and telia. 6 
Life-cycle with pycnia and telia. 7 
Teliospores not flattened, but urediniospores flattened laterally. 8 
Teliospores free, two to eight at apex of a common stalk. 
Life-cycle with all spore-forms. 9, TRANZSCHELIA. 
Life-cycle with pycnia and telia. 10. PoLYTHELIS. 
Pyenia subcuticular, other sori subcuticular or subepidermal ; telia erumpent, teliospores free, wall 
with a more or less evident gelatinous layer, pores when more than one in a cell placed later- 
ally; aecia when present without peridium ; uredinia when present without peridium, but 
usually encircled by paraphyses, spores borne singly on pedicels. Subfamily UROPYXIDATAE. 
Teliospores with evident gelatinous layer, the pores lateral. 
. DICHEIRINIA. 
. PILEOLARIA, 
. DISCOSPORA, 
. HEMILEIA. 
Teliospores three-celled. 11, PHRAGMOPYXIS. 
Teliospores two-celled. 
Life-cycle with pycnia, uredinia and telia. 12. Uropyxis. 
Life-cycle with pycnia and telia. 13. CALLIOSPORA. 
Teliospores with obscure gelatinous layer, the pores apical. 
Teliospores with appendaged pedicels. 14. PROSPODIUM. 
Teliospores without appendaged pedicels, 15. NEPHLYCTIS. 
Pyenia subcuticular, other sori subepidermal ; telia erumpent, teliospores free, wall firm, pores 
when more than one in a cell placed laterally ; aecia when present without peridium ; uredinia 
when present without reridium, but usually encircled by paraphyses, spores borne singly on 
pedicels. Subfamily PHRAGMIDIATAE 
Teliospores mostly tuberculate, the pores more than one and lateral. 
Life-cycle with all spore-forms. 16. PHRAGMIDIUM. 
Life-cycle with pycnia, aecia and telia. — 17. EARLEA. 
Life-cycle with pycnia, uredinia and telia. 
Teliospores one-celled. 18. TRACHYSPORA. 
Teliospores three-celled. 19. TRIPHRAGMIUM. 
Life-cycle with pycenia and telia. 
Teliospores one-celled. 20. AMERIS. 
Teliospores three-celled. 21. NYSSOPSORA. 
Teliospores mostly smooth, the pores one in a cell and apical. 
Life-cycle with pycnia, aecia and telia. 
Teliospores two-celled. 22. GYMNOCONIA. 
Teliospores many-celled. 23. XENODOCHUS. 
Life-cycle with pycnia, uredinia and telia. 
Teliospores one-celled. 24. SPIRECHINA. 
Teliospores three- to thirteen-celled. 25. KUEHNEOLA. 
Pycnia and other sori subepidermal ; telia erumpent, teliospores free, but imbedded more or less 
in a gelatinous matrix, wall firm, pores usually more than one in a cell and lateral ; aecia when 
present with peridium, dehiscent by longitudinal slits; uredinia unknown. Subfamily 
AECIDIATAE. . . . 
Life-cycle with pycnia, aecia and telia, : : _26. AECIDIUM. 
Pycnia and other sori subepidermal ; telia erumpent or sometimes indehiscent, teliospores free, 
wall firm, pores one ina cell and apical ; aecia when present with peridium rupturing at apex, 
or without peridium ; uredinia when present without peridium, rarely with encircling para- 
physes, spores borne singly on pedicels. Subfamily DicarOMATAE. 
Teliospores colorless ; aecia more or less indefinite, usually without peridium. 
VoLuME 7, Parr 2, 1907] ba 129 
