Host plants: 



For the aecia: Amelanchier canadensis (L.) Medic, A. erecta 

 Blanch., A. intermedia Spach., A. oligocarpa (Michx.) 

 Roem., A . oblongifolia (Torr. & Gray) Roem., A. rotundi- 

 folia (Michx.) Roem., Aronia arbutifolia (L.) Ell., A. atro- 

 purpurea Britton, A. nigra (Willd.) Britton, A. monstrosa 

 Zabel {A. arbutifoliaXSorbus americana), Crataegus colonica 

 Beadle, C. crus-galli L., C. dispar Beadle, C. flava Ait., 

 C. Jonesae Sarg., C. mollis (Torr. & Gray) Scheele, C. punc- 

 tata Jacq., C. Reverchoni Sarg., C. rotundifolia Moench, 

 C. spatulata Michx., Cydonia vulgaris (L.) Pers., C. japonica 

 (Thunb.) Pers. (Chaenomeles japonica Lindl.), Malus Malus 

 (L.) Britton (Pyrus Malus L.). 

 For the telia: Juniperus communis L., /. sibirica Burgsd. 

 (/. nana Willd.), /. virginiana L. 

 Type locality: Philadelphia, Pennsylvania, "in germinibus 

 Rosae," error for Crataegus. 



Distribution: From Maine west to northern peninsula of 

 Michigan and Iowa, south to northern Florida and Texas. 



Illustrations: Hedwigia34: 3,/. 7; Bot. Gaz. 49: pi. 21, f. 9. 



Exsiccati: Seym. & Earle, Econ. Fungi 234, 235, 236, 237, 238; 



Rav. Fungi Am. 271, 272, 302; Ellis, N. Am. Fungi 1083a, 1084; 



Ellis & Ev. N. Am. Fungi 2224; Ellis & Ev. Fungi Columb. 54, 



1732; Thiim. Myc. Univ. 44; Kellerm. Ohio Fungi 21. 



23. Gymnosporangium juniperinum (L.) Mart. Fl. Crypt. 



Erlang. 333. 1817 

 Tremella juniperina L. Sp. PL 1157. 1753. 

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



1791. 

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

 Centridium Ariae Desm. PI. Crypt. 1378. 1845. 

 Roestelia penicillata Fries, Sum. Veg. Scand. 2: 510. 1849. 

 Ceratitium penicillatum Rabenh. Bot. Zeit. 9: 452. 1 85 1. 

 IPodisoma Gymnosporangium Bon. Handb. 148. 1851. 

 Podisoma tremelloides A. Braun, Bot. Zeit. 25: 94. 1867. 

 Gymnosporangium tremelloides R. Hartig, Lehr. Baumkr. 1: 333. 



