68 NORTH AMERICAN FLORA [Volume 7 



4. D. Alismaiis. 



6. D. occulta. 



7. DOASSANSIA Cornu, Ann. Sci. Nat. VI. 15: 285. 1883. 



Setchellia Magn. Ber. Deuts. Bot. Ges. 13: 468. 1895. 

 Doassansiopsis Dietel, in E- & P. Nat. Pfl. l^*-*: 21. 1897. 



Sori in various parts of the host, usually in the leaves, rather permanently embedded 

 in the tissues ; spore-balls conspicuous, permanent, consisting of a distinct cortical layer 

 and a central mass of fertile cells entirely filling the interior or with innermost spores 

 supplanted by parenchymatous cells or hyphal threads ; spores hyaline or yellowish, with 

 smooth usually thin walls, of medium size; germination often in situ, by means of a short 

 promycelium which gives rise to a terminal group of elongate sporidia and these often 

 bearing secondary and even tertiary groups. 



Type, Sclerotium Alisfnatis Nees. 



EuDOASSANSiA. Spore-balls within the cortex consisting entirely of 

 spores. 

 Sori forming scarcely thickened spots in leaves. 



Cortical cells inconspicuous, 8-10ai. 1. D. Epilobii. 



Cortical cells conspicuous, 10-20^1 in length. 



Cortical cells oblong to cubical; spore-balls 100-160^^. 2. D. ranunculina. 



Cortical ceUs ovate to subspherical ; spore-balls 100-125/^. 3. Z>. Sagittariae. 



Cortical cells radially elongate, chiefly oblong ; spore-balls 

 120-180^^. 

 Sori forming opaque pustules in leaves. 5. D. opaca. 



Doassansiopsis. Spore-balls within the cortex consisting of one or more 

 layers of spores and a central mass of parenchymatous cells. 

 Son in ovaries. 



Sori in leaves. 



Sori not causing distortion of tissues. 



Spore-balls subspherical or spherical, 100-160m. 7. D. Marhanoffiana. 



Spore-balls ellipsoidal to spherical, 200-300^. 8. D. tntermedia. 



Sori causing conspicuous distortion of tissues. 9. D. deformans. 



PSEUDODOASSANSiA. Sporc-balls within the cortex consisting of several 

 layers of spores and a central mass of interwoven hyphae. 10. D. obscura. 



1. Doassansia Epilobii Farl. Bot. Gaz. 8: 277. 1883. 



Sori in leaves, thin, forming at first yellowish but later dark-brown spots in which the 

 aggregated spore-balls show as minute darker- colored elevations ; spore-balls situated in 

 the spongy parenchymatous tissue, usually clustered, consisting of a rather indefinite cor- 

 tex and a spore-mass entirely filling the interior, ellipsoidal to irregularly spherical, 120- 

 220^ in length ; cortical cells dark-brown, irregularly polyhedral or flattened radially, with 

 thick walls, small, 8-10/^ in length; spores light-brownish, broadly ellipsoidal to irregu- 

 larly polyhedral or subspherical, with smooth moderately thick walls, chiefly 8-12/^ in length. 



On Onagraceae : 



Epilobium alpinum, New Hampshire. 

 Type locality : White Mountains (King's Ravine), New Hampshire, on Epilobium alpinum. 

 Distribution : Known only from the type locality. 

 Illustration: Ann. Bot. 6 : pi. 2,f. 66. 

 ExSicCATi : Kllis, N. Am. Fungi 1486. 



2. Doassansia ranunculina Davis, Bot. Gaz. 19: 416. 1894. 



Sori in leaves, thin, forming light-brown spots 2-4 mm. in diameter, with the spore- 

 balls showing as numeroiiis minute clustered papillae ; spore-balls developed in both pali- 

 sade-layer and spongy parenchyma, consisting entirely of fertile cells surrounded by a 

 definite cortex, ovoid to spherical, about 100-160 ^ in length ; cortical cells reddish-brown, 

 polyhedral or cubical to oblong, often irregular, thin-walled, moderately prominent, chiefly 

 10-18 II in length ; spores hyaline to yellowish, chiefly subspherical or polyhedral, with thin 

 smooth walls, about 10-14 fi in diameter. * 



On RanunCulaceae : -^ 



Ranunculus delphinifohus {R.mulhjidus), Wisconsin 



Type locality: Racine, Wisconsin, on Ranunculus muliifidus {R. delplnntfolius) . 

 Exs™cl'S?BliirAv" n" A^ Fungi 3238; Bjllis & Ky. Fungi Columb. 1531 ; Sydow, Ust. 337. 



