Part 1, 1906] TILI.BTIACBAB 71 



Distribution : New Hampshire to Minnesota and Iowa ; Canada. 



Illustration : Bot. Gaz. 19 : pL 18, f. 1. 



BxsiCCATi : :E)His & Ev. N. Am. Fungi JJ^i; EJllis & Ev. Fungi Columb. 862. 



9. Doassansia deformans Setch. Proc. Am. Acad. 26: 17. 1891. 



Doassansiopsis deformans Dietel, in E. & P. Nat. Pfl. li** : 21. 1897. 



Sori in various parts of the host, usually causing conspicuous distortions when in the 

 ■petioles or midribs, sometimes even 2-3 cm. in width by 7-8 cm. in length; spore-balls 

 filling intercellular spaces, consisting of a cortical layer surrounding a single layer of fertile 

 cells and a central mass of parenchymatous cells, spherical, 100-140// in diameter; cortical 

 ceils polyhedral, occasionally slightly elongate tangentially, sometimes even triangular in 

 cross-section, small, 4-6^X8-12 /i; parenchymatous cells thin-walled, without contents, 

 chiefly larger than the spores, sometimes even 22 fi in length ; spores ovoid to polyhedral, 

 rather firmly united, with rather thin smooth walls, 8-12 /i, rarely 15//, in length. 



On Alismaceae : 



Sagittaria latifolia {S. variabilis), Connecticut, Illinois, Massachussetts, Missouri, Rhode 



Island, South Dakota, Wisconsin ; Canada. 

 Sagittaria sp., Florida, Texas. 

 Type locality : Norwich, Connecticut, on Sagittaria variabilis {S. latifolia). 

 Distribution : New England to South Dakota, Florida and Texas : Canada. 

 Illustration : Ann. Bot. 6 : pi. l,f. 51-58, pi. 2,f 81. 



ExsiCCATi : Ellis & Ev. N. Am. Fungi 2705 ; Ellis & Ev. Fungi Columb. 272 ; Rab.-Wint- 

 Paz. Fungi Eur. 4002; Seym. & Earle, Econ. Fungi C8. 



10. Doassansia obscura Setch. Proc. Am. Acad. 26: 16. 1891. 



Sori not evident, the spore-balls being produced in the interior of the basal parts of the 

 petioles without special distortion or discoloration though evident upon rupture of the 

 enclosing tissues ; spore-balls arranged in single rows in the air-chambers, consisting of a 

 distinct cortex surrounding several irregular layers of spores and a central mass of indefi- 

 nite fungous hyphae, oblong to subspherical, large, 150-300// in length; cortical cells 

 rather light-brown and thin-walled, ovoid to obovate or subcordate, conspicuous, 12-18 /i 

 X8-12/i; spores light-brown, chiefly subspherical, with thin smooth walls, about 8-12 /i in 

 diameter. 



On Alismaceae : 



Sagittaria latifolia {S. variabilis), Connecticut, Massachusetts. 

 Type locality: Norwich, Connecticut, on Sagittaria variabilis (5". latifolia). 

 Distribution : Massachusetts and Connecticut. 

 Illustration : Ann. Bot. 6 : pi. l,f. 33-42, pi. 2,f 75-77. 



Excluded species 



Doassansia Sintenisii Bres. Bot. Jahrb. 17 : 489. 1893. On Cedrela odorata. Probably 



insect work. 



Doassansia Zizaniae Davis, Bot. Gaz. 26 : 353. 1898. On Zizania aquatica. Sclero- 



tium of some fungus. 



TRACYA 



1901. 



Cornuella Setch. Proc. Am. Acad. 26 : 19. My 1891. Not Cornuella Pierre. Ja 1891. 



Sori in the leaves (fronds), permanently imbedded in the tissues; spore-balls con- 

 spicuous, without cortical layer, composed of a single layer of fertile cells enclosing a net- 

 work of septate filaments ; spores hyaline to yellowish, firmly united, of small to medium 

 size ; germination as in Doassansia . 



Type, Cornuella Lemnae Setch. 



1. Tracya Lemnae (Setch.) Sydow, Hedwigia Beibl, 40 : 3. 1901. 



Cornuella Lemnae Setch. Proc. Am. Acad. 26 : 19. 1891. 



Sori in the languishing fronds, rather indefinite, showing the spore-balls as very minute 

 clustered or scattered opaque bodies ; spore-balls situated in the spongy parenchyma above 

 the lower epidermis, consisting of ^ single layer of fertile cells within which is a loosely 

 arranged network of brownish filaments, ellipsoidal to spherical, small, 50-100 /i in length ; 



