Part 3, 1912] AECIDIACEAE 199 



scattered, solitary or often aggregated and confluent, very irregular, varying greatly in size, 

 1-3 mm. across, at first somewhat applanate and rather low or pulvinate, becoming con- 

 siderably expanded when fully mature, light chocolate-brown becoming yellowish by germi- 

 nation, the ruptured bark and cortical tissues conspicuous ; teliospores 2-celled, broadly 

 ellipsoid m general outline, 16-22 by 31^2/., usually narrowed below, sometimes rounded 

 above or more often slightly attenuate at the apex and sometimes slightly enlarged near the 

 septum in one or two places on one or both cells owing to the presence of hyaline papillae 

 over the germ-pores, not or only rarely constricted at the septum ; wall light cinnamon- 

 brown, thin, about 1 m, papillae 2-5 /i, the pores 1 or 2 in each cell, apical or near the sep- 

 tum; pedicel cylindrical, uniform, 4-7 m in diameter, rather long. 



On Juniperaceae : 



Juniperus sibirica Burgsd. (/. nana WiUd.), Colorado, Michigan. 



Type locality : Norway, on Sorbus Aucuparia. 



Distribution : Greenland south to New York and Wisconsin, and in mountains of Wyoming 

 and Colorado ; also m Kurope. 



Illustrations : Overs. Danske Vid. Selsk. Forh. 1866 : pi. 3-4; E. & P. Nat. Pfl. 1^** : /. JJ. 



// Ji r?r-A^o*->.9*'??> ^\P- ^^^' ^°*- ^^^- '^^'' P^' ^^'f' ^^' ^""- N- Y- Sot. Card. 7: 455. /. 

 ii , pi. Ij^,j.Jy;pi. 160, J. 63. 



KxsicCATi : ]Sllis, N. Am. Fungi 1089; Seym. & Earle, Econ. Fungi 248x. 



17. Gymnosporangium exterum Arth. & Kern ; Arth. 



Mycologia 1 : 254. 1909. 



0. Pycnia epiphyllous, rather few, gregarious, very sparsely disposed in indefinite 

 groups 2-6 mm. across, on larger discolored spots, prominent, conspicuous, punctiform, 

 flattened-globoid, 95-125 m in diameter by 65-90^ high ; ostiolar filaments 48-65 ju long. 



1. Aecia hypophyllous, gregarious, very sparsely disposed in large groups 4-10 mm. or 

 more across, on larger discolored areas, 0.1-0.3 mm. in diameter by 0.5-0,8 mm. high; 

 peridium soon becoming rather finely lacerate almost to base, spreading but not revolute; 

 peridial cells usually seen only in face view, not hygroscopic, remaining straight when wet, 

 lanceolate in face view, 10-18 by 58-100 ju, the inner wall rugose with rather narrow ridges 

 running downward and outward, side view only rarely observed, the side walls rugose with 

 transverse ridges extending clear across, 3-5 /z thick; aeciospores broadly ellipsoid or 

 globoid, 17-21 by 21-26ju ; wall very pale cinnamon-brown, moderately thick, 2-2. 5ju, very 

 finely verrucose, the pores evident, 8-10, scattered. 



On Rosaceae: 



Porter anthus stipulatus (Muhl.) Britton {Gillenia siipulacea Nutt., Spiraea stipulata 

 Muhl.), Missouri, Kentucky. 



III. Telia caulicolous, from a perennial mycelium, appearing on fusiform swellings 

 2-6 cm. long by 0.5-1.5 cm. or more in diameter, causing a considerable roughening and 

 exfoliation of the bark, flattened and applanate, irregular and indefinite in outline, usually 

 anastomosing over practically the whole surface of a swelling, light chocolate-brown becom- 

 ing j^ellowish by germination ; teliospores 2-celled, ellipsoid, 18-23 by 32-42 m, rounded or 

 sometimes narrowed above and below, very slightly or not at all constricted at the septum ; 

 wall light cinnamon -brown, rather thin, 1-1.5 m, usually slightly thicker at apex, the pores 

 lin a cell, apical; pedicel cylindrical, uniform, slender, 3-4 ^ in diameter, very long. 



On Juniperaceae : 



Juniperus virginiana L. {Sabina virginiana Ant), Kentucky. 

 Type locality: Mammoth Cave, Kentucky, on Juniperus virginiana. 

 Distribution : Small area from central Kentucky to southeastern Missouri. 

 Illustration : Bull. N. Y. Bot. Card. 7 : pi. 157,/. 56. 

 ExsicCATi: Rab.-Wint. Fungi 'BMr.3323. 



18. Gymnosporangium juniperinum (I^.) Mart. Fl. Crypt. 



Erlang. 333. 1817. 



Tremella juniperina L- Sp. Pi. 1157. 1753. ^ ^^ ^ ^ , .^- .„- 

 Aecidium penicillatum Pers, in J. F. Gmel. Syst. Nat. 2 : 1472. 1791. 

 Caeoma penicillatum Schlecht. Fl. Berol. 2: 111. 1824. 

 Centridium Ariae Desmaz. PI. Crypt. 1378. 1845. . 



Roestelia penicillata Fries, Summa Veg. Scand. 510. 1849. 

 Ceratitium penicillatum Rab. Bot. Zeit. 9: 452. 1851. 



