Part 4, 1920} AECIDIACEAE 327 
III. Telia hypophyllous, scattered, elliptic or oblong-linear, small, 0.5-1 mm. long, be- 
coming naked by the longitudinal rupture of the epidermis, chestnut-brown, ruptured epidermis 
apparent; teliospores ellipsoid, 20-26 by 32-38 yu, rounded at both ends, conspictiously con- 
stricted at septum; wall chestnut-brown, uniformly 2-2.5 uw thick, verrucose with prominent 
irregular warts; pedicel colorless, sometimes attached laterally or at an angle, short, fragile. 
On POACEAE: 
Melica Smithii (Porter) Vasey (Avena Smithii Porter), Michigan. 
TYPE Locality: Chatham Station, Michigan, on Melica Smithii. 
DisTRrBution: Known only from the type locality in northern Michigan. 
79. Dicaeoma epiphyllum (L.) Kuntze, Rev. Gen. 3: 468. 1898. 
Lycoperdon epiphyllum I,. Sp. Pl. 1185. 1753. 
Aecidium Tussilaginis Pers. in J. F. Gmel. Syst. Nat. 2: 1473. 1791. 
Lycoperdon Farfarae Duval, Bot. Tasch. Hoppe 1793: 257. 1793. 
Aecidium compositarum Mart. Fl. Crypt. Erlang. 314. 1817. 
Puccinia Poarum Nielsen, Bot. Tidsskr. III. 2:34. 1877. 
Myxosporium Tussilaginis Sacc. Myc. Ven. 993. 1877. 
Aecidiolum Tussilaginis Sace. Michelia 1: 242. 1878. 
Uredo Boutelouae Arth. Bull. Iowa Agr. Coll. Dep. Bot. 1884: 164. 1884. 
Puccinia epiphylla Wettst. Verh. Zool.-Bot. Ges. Wien 35: 541. 1886. 
Uredo Airae Lagerh., Jour. de Bot. 2: 432. 1888. 
Aecidium Petasitidis Sydow, Oesterr. Bot. Zeits. 51:20. 1901. 
Uredo anthoxanthina Bubak, Ann. Myc. 3: 223. 1905. 
Puccinia Deschampsiae Arth. Bull. Torrey Club 37: 570. 1910. 
O. Pycnia epiphyllous, few, in crowded circular groups, on discolored spots 2-5 mm. in 
diameter, honey-yellow becoming brownish, inconspicuous, globoid in vertical section, 130- 
155 w in diameter; ostiolar filaments short. 
I. Aecia hypophyllous, crowded in circular groups 2-5 mm. across, on discolored spots, 
cupulate, 0.3-0.5 mm. in diameter; peridium low, colorless, the margin finely erose, somewhat 
recurved, peridiai cells angularly oblong or rhomboidal, the outer wall smooth, transversely 
striate, thick, 7-12 », the inner wall verrucose, somewhat thinner, 3-7 »; aeciospores angularly 
globoid or oblong, 15-21 by 19-26 u; wall colorless or very pale-yellow, thin, 1-1.5 u, very 
minutely and closely verrucose, appearing smooth when wet. 
ON CARDUACESE: 
Petasites corymbosa (R. Br.) Rydb. (P. palmata frigida Macoun, Tussilago corymbosa R. 
Br.), Alaska. 
Petasites frigida (L,.) Fries, Alaska. 
Tussilago Farfara L,., Nova Scotia. 
II. Uredinia chiefly epiphyllous, scattered, round or oblong, 0.1-0.3 mm. broad by 0.2- 
0.5 mm. long, soon naked, pulverulent, orange-yellow or cinnamon-brown, ruptured epidermis 
apparent; paraphyses chiefly peripheral, very numerous, variously bent and incurved, capitate 
with narrow neck and linear-clavate pedicel which is often solid, or sometimes clavate-capitate, 
10-16 by 48-80 yu, the wall smooth, light golden-brown, 2-4 » thick; urediniospores ellipsoid, 
16-24 by 19-29 u; wall colorless or golden-yellow, thin, 1-1.5 y, occasionally 2 u, closely and 
rather prominently echinulate, the pores 8-10, scattered, usually distinct. 
III. Telia hypophyllous, few, scattered, oblong, 0.3-1 mm. in length, pulvinate, dark- 
gray, long covered by the epidermis, bordered by a thin layer of stromal hyphae; teliospores 
oblong, clavate or cylindric, 15-23 by 34-61 », truncate, rounded or obtuse above, usually 
narrowed below, slightly or not constricted at septum; wall dark chestnut-brown above, paler 
below, thin, 1-1.5 uw, slightly thickened above, 3-5 u; pedicel very short, tinted. 
ON POACEAE: . ‘ 
Alopecurus alpinus I,. (A. occidentalis Seribn.), Colorado. ; 
Alopecurus aristulatus Michx. (A. fulous Smith, A. geniculatus aristulatus Torr), Utah. 
Alopecurus geniculatus L., Indiana, Nebraska. _ 
Anthoxanthum odoratum 1,., Maine; Nova Scotia. 
Catabrosa aquatica (L.) Beauv. (Aira aquatica L.), Nebraska, Utah. 
Deschampsia caespitosa (L..) Beauv. (Aire alpina L., A. caespiiosa L.), Colorado; Alberta. 
Festuca Myuros L., Mexico (state). 
Phleum alpinum L., Colorado. 
Poa alpina 1,., Colorado. 
la Merrill, Oregon. 
pes ane L. (P. rapa H.B.K.), California, Delaware, New York, Oregon; Alberta; 
Mexico (state); Guatemala. 
Poa arachnifera Torr., Tennessee. 
