Part 3, 1912] AECIDIACEAB 171 



tured epidermis inconspicuous ; paraphyses none ; teliospores short-cylindrical, 26-29 by 62- 

 80//, slightly or not narrowed above and below, 5-8-celled ; wall blackish-brown, 5-7 /^ thick, 

 closely and finely verrucose, the apex with a conical hyaline papilla 1-5 // long, smooth ; pedi- 

 cel rugose when dry, once and a fourth length of spore, the upper part colored especially 

 near the spore, 7-9^ in diameter, 26-35// long, the lower part colorless, 65-112 fi long, 

 swelling in water to claviform and becoming 23-30// in diameter. 



On Rosaceae : 



I^osa Engelmanni S. Wats., Nebraska, South Dakota. 

 Rosa Fe7tdleri Cr€pin, Colorado, Nebraska, South Dakota. 



Rosa Maximtliani Nees {R. Woodsii S. Wats, not I,indl.), Colorado, Nebraska. 

 Rosa heliophila Greene {R. arkansana S. Wats, not Porter, R. pratincola Greene), Illinois, 

 Towa, Kansas, Missouri, Nebraska, South Dakota. 

 Type locality : Manhattan, Kansas, on '* Rosa arkansana, ^^ now determined as R. heliophila. 

 Distribution : Prairies from Missouri and eastern Colorado nearly to the northern boundary 

 of the United States. . 



BxsicCATi: Carleton, Ured. Am. 15 ; Ellis & Ev. Fungi Columb. 1632, 1947 ; Sydow, Ured. 

 1093; Seym. & Earle, Econ. Fungi JJ; D. Griff. W. Am. Fungi 37. 

 Illustrations : Torreya 9 : 23,/. 4; Hedwigia 44: pi. 4,f. 2. 



11. Phragmidium disciflorum (Tode) J. F. James, Contr. U. S. Nat. 



Herb. 3 : 276. 1895. 



Ascophora discijiora Tode, Fungi Meckl. 1 : 16. 1790. 

 Ascophora discijiora a solida Tode, Fungi Meckl. 1 : 16. 1790. 

 Uredo Rosae Pers. Neues Mag. Bot. 1 : 93. 1794. 

 Puccinia mucronaia a Rosae Pers. Neues Mag. Bot. 1 : 118. 1794. 

 Uredo Rosae-cenhfoliae Pers. Syn. Fung. 215. 1801. 

 ifredo Rosae Schum. Enum. PL Saell. 2 : 230. 1803. 

 Puccinia Rosae Schum. Enum. PI. Saell. 2 : 235. 1803. 

 Aregma mucronaia Fries, Obs. Myc. 1 : 225. 1815. 

 Uredo effusa a Rosae Mart. Fl. Crypt. Erlang. 318. 1817. 

 Caeoma Rosae Schlecht. Fl. Berol. 2 : 120. 1824. 

 Phragmidium mucronaium Schlecht. Fl. Berol. 2 : 156. 1824. 

 Caeoma Rosae punctiforme Link, in Willd. Sp. PI. 62 : 30. 1825. 

 Erysibe Rosae Wallr. Fl. Crypt. Germ. 2 : 200. 1833. 

 Brannium m-iniatum. Bon. Coniom. 17. 1860. 

 Phragm,tdium oblongum Bon. Coniom. 60. 1860. 

 Phragmidium Rosarum Fuckel, Symb. Myc. 47. 1869. 

 Aregma dzscijlora Arth. Proc. Ind. Acad. Sci. 1898 : 179. 1899; 



0. Pycnia chiefly epiphyllous, usually few, gregarious and often somewhat confluent, 

 inconspicuous, pale honey-yellow, flatten ed-conoidal or discoidal, extending into the lateral 

 walls of the epidermal cells, 112-150 /^ in diameter by 35-40 /a high. 



1. Aecia hypophyllous and cauHcolous, roundish or oblong, 1-2 mm. across, usually 

 crowded and confluent over considerable areas, on the stems sometimes 2-4 mm. wide by 

 5-15 mni. long, applanate, bright orange-yellow fading to pale-yellow, ruptured epidermis 

 usually conspicuous ; paraphyses numerous but not conspicuous, surrounding each indi- 

 vidual sorus, erect, exceeding somewhat the height of the spore-mass, clavate-capitate, 

 10-21 by 50-80/^, the wall evenly thin, 1 /i, nearly or quite colorless, smooth; aeciospores 

 broadly ellipsoid or globoid, 15-20 by 22-29 ii ; wall pale-yellow, rather thick, 2-3 /^, finely 

 and distinctly verrucose, the pores large, indistinct. 



II. Uredinia hypophyllous, numerous, thickly scattered, round, 0.1-0.2 mm, across, 

 early naked, ruptured epidermis inconspicuous ; paraphyses encircling the sorus, abundant 

 and conspicuous, strongly incurved, cylindrical or somewhat clavate, 9-13 by 55-74/^, the wall 

 evenly thin, 1 /^ or less, nearly or quite colorless, smooth; urediniospores obovate or obo- 

 vate-globoid, 16-19 by 20-26 fi ; wall pale-yellow, moderately thick, 2 //, closely verrucose- 

 echinulate, the pores indistinct, small, scattered, 8 or more. 



III. Telia hypophyllous, at first arising from the uredinia, numerous, thickly scattered, 

 about 0.1 mm. across, but appearing much larger on account of the large number of spores 

 in each sorus, early naked, blackish, ruptured epidermis inconspicuous ; paraphyses none ; 

 teliospores oblong-terete or slightly obovate-terete, 22-33 by 64-90^, slightly narrowed 

 above and below, 5-9-celled; wall blackish-brown, opaque, 5-7^ thick, closely and very 

 coarsely verrucose with semihyaline tubercles, the apical projection prominent, conical, 7- 

 13 II long, semihyaline, not grading into the rounded uppermost cell, distinctly roughened ; 



