321 



Pucciniastrum Abieti-Chamaenerii Kleb. Jahrb. Wiss. Bot. 34:387. 

 1900. 



On Onagraceae: II. 



Epilobium coloratmn MuhL, Mt. Cuba, Sept. 20, 1893, A. Com- 

 mons (2262). 



Klebahn (Zeits. Pflanzenkr. 9:22-26. 1899) and other European in- 

 vestigators have shown that the aecial stage of the rust on species of 

 Epilobium belonging to the section Chamaenerion occurs in Europe on 

 Abies pectinata. 



Eraser in 1910 (Mycol. 4:176. 1912) was the first in America to 

 record successful cultural experiments with this species. He showed 

 that the aecia were found on Abies balsamea using- for infection telia 

 from Epilobium angustifoliuvi collected in Nova Scotia. The aeciospores 

 thus produced were used to infect Epilobium angustifolium and the 

 typical uredinia of this species resulted. Weir and Hubert (Phytopath. 

 6:373. 1916) using telial material from the same host collected in Idaho 

 obtained development of pycnia on Abies lasiocarpa. 



It will be noted that all the cultural work has been conducted 

 with but one American species of Epilobium which belongs in the same 

 group as those successfully cultured in Europe. It is probable that 

 there are at least two distinct biological races involved. Sydow (Monog. 

 Ured. 3:442-444. 1915) recognizes two species. 



See also Phytopathology 8:328-329. 1918 for a review of more 

 recent work. 



17. Uredinopsis Atkinsonii Magn. Hedwigia 43:123. 1904. 



On Polypodiaceae : 



Dryopteris Thelypteris (L.) A. Gray, Stanton, July 13, 1894, 



A. Commons (2471). 



Eraser in 1912 (Mycol. .5:236. 1913) proved that this species has its 



aecial stage on Abies balsamea {Peridermiuvi balsameum Pk. p. p.) by 



successfully infecting Dryopteris Thelypteris with aeciospores from 



Abies balsamea with production of uredinia. 



18. Uredinopsis mirabilis (Pk.) Magn. Hedwigia 43:121. 1904. 

 Septoria mirabilis Pk. Ann. Rep. N. Y. Mus. 25:87. 1873. 



On Polypodiaceae: 



Lorinseria areolata (L.) Presl., Selbyville, Oct. 4, 1907, (1755). 

 Onoclea sensibilis L., Nev.-ark, Oct. 1907, (2259). 



21—11994 



