42 NORTH AMEJRICAN FLORA [Voi^UME 7 



Sori in the seeds, showing when the legumes are broken open as reddish-brown dusty 

 spore-masses which have destroyed most of the seeds ; spore-balls reddish-brown, ovoid to- 

 spherical, rather firm, composed of 3-25 (usually 7-12) spores, chiefly 27-60 (i in length; 

 spores in optical section triangular to polygonal or when free also showing irregular oblong 

 forms, on free surface provided with usually prominent papillae that sometimes vary to- 

 spiny processes, 15-25 //, chiefly 15-20 /z, in length. 



On Fabaceae : 



Astragalus bisulcalus^ Colorado. 



Astragalus Drummondii^Qs^six^^Q, 



Astragalus m. issouriensis jf utah) 



Astragalus JVuttallianus , Arizona. 



Astragalus scopuloru?n, Colorado, 



A straga lus sp . , Arizon a . /"^'^ 



Homalobus tenellus {Astragalus multi/lorus) ^ ^taS ^ 



Lotus humistraluSj Arizona. "~" 



Lotus micranihus {Hosackia parviflora) ^ Washington. 



Lupinus sp., Colorado. 



Meibomia grandifiora {Desmodium acuminatum)^ New Jersey. 

 Meibomia nudijiora {DeSTnodium nudifiorum) , Maryland, Pennsylvania. 

 Trifoliuwi irident^ium, California. 

 Vicia americana,i^X^^ 

 Vicia caroliniana^^ York. 

 Type locality : Mascara, Algeria, on Medicago tribuloides. 



Distribution : New York to Maryland ; Colorado to Washington and Arizona ; also in Europe 

 and Africa. 



Illustrations : Ann. Sci. Nat. III. 7 : pi. 4,f. 23 ; Brefeld, Unters. Gesaramt. Myk. 5 : pi. 



11, J. a— 12. 



BxsiCCATi: Elhs & :ev. Fungi Columb. 136; Ellis & Ev. N. Am. Fungi 1100, 2264; Griff. 

 West Am. Fungi JJi; Seym. & Earle, Econ. Fungi C49, C123. 



6. Thecaphora mexicana Ellis & Ev.; Clinton, Jour. Myc. 8 : 146. 1902. 



Sori on stems, prominent, forming clustered subglobose pustules each about 4 mm. in 

 diameter, firm, upon rupture scattering dusty umber spore-mass and leaving behind the 

 remains of the hollowed pustules ; spore-balls light reddish-yellow, ovoid to spherical, com- 

 posed of 15-30 spores separated by prominent hyaline areas that apparently widen with ma- 

 turity, 50-90 (I in length ; spores angular when young but with age becoming more rounded, 

 irregular, oblong to polyhedral or subspherical , with distinct inner and outer coats, the 

 latter thick and provided with prominent irregular papillae, chiefly 16-22 fi, the most elongate 

 rarely 25 fi, in length. 



On Cardttaceae : 



Guardiola platyphylla, Mexico. 

 Type locality: Mexico, on Guardiola plaiyphylla. 

 Distribution : Known only from the type locality. 



7. Thecaphora tunicata Clinton, Proc. Bost. Soc. Nat. Hist. 31: 422. 1904. 



Sori in the flowers, forming subspherical bodies about 2-3 mm. in diameter, enclosed 

 by the floral envelopes, at first firm but later shedding out the granular spore-mass ; spore- 

 balls light chestnut-brown, oblong to chiefly subspherical or spherical, composed of many 

 spores, firmly united (at least at first), chiefly 70-100 // in length ; spores subhyaline or 

 yellowish-tinted, with free surface at least provided with a prominent deeper-colored verru- 

 cose epispore (sometimes even 3-6 \i thick), quite irregular, chiefly oblong to subspherical^ 

 12-18/^, or the most elongate-clavate forms even 27 //, in length. 



On Nyctaginaceae : 



Boerhaavia sp., Mexico. 

 Type locality : Chihuahua, Mexico, on Boerhaavia sp. 

 Distribution : Known only from the type locality. 



8. Thecaphora Thomberi Griff. Bull. Torrey Club 31 : 88. 1904. 



Sori in ovaries, generally clustered in the inflorescence, subspherical, about 2-5 

 mm. in horizontal diameter which usually slightly exceeds the vertical, upon rupture dis- 

 closing reddish granular spore-mass ; spore-balls light chestnut-brown, ovoid to spherical, 

 rather regular, very firm (at least when young), composed of many spores, chiefly 80-125 ^' 

 in length ; outer spores at least covered with an evident light chestnut-colored membrane or 

 exospore which is somewhat papillate or wrinkled on exposed surface, but inner spores- 



