378 



is some question as to tlie defiuitcness regarding the placement of the 

 form in the unattached list. Notes are also added in some other cases. 



The arrangement in the list is according to host families and genera 

 in the sequence used in Britton and Brown's Illustrated Flora of the 

 Northern States and Canada, supplemented by Eugler and Prantl's Natiir- 

 liche Pflanzen-familien in cases where the host is not within the range 

 of the former work. The provisional key precedes this list and follows in 

 this connection. 



KEY TO THE TTNATTACHED SPECIES OF AECIDIUM IX NORTH 



AMERICA. 



I. Aecia scattered, arising from diffused mycelium : 



Host belonging to ITrticaceae A. lihcrtum 10 



Host belonging to Chenopodiacae A. Eurotiae 12 



Host belonging to Caryophyllaceae A. Cerastii 15 



Host belonging to Fumariaceae I. Dicentrae 27 



Host belonging to Malvaceae: 

 Aeciospores with thin walls : 

 Peridia fugacious, aecia more or less clliiitical 



in outline 1. tiihcrviihitinn 4s 



Peridia less fugacious, aecia practically circular 



in outline 1. sp. 49 



Aeciospores with vei'y thick walls 1. iiitcrvoiiciis '>0 



Host belonging to Iloloragidaceac t. rrosipiiiaccac 59 



Host belonging to Boraginaceae 1. Mi/o.'iotidis G9 



Host boloiiging lo Solonacoae 1. I'Jn/salidift 72 



Host belonging to Scr()i)hulariaceae -1. ColUusiac 77 



Host belonging to Valcrianacoae 1. ^'nlr)■iancUac S(i 



Host belonging to Cichoriaceae 1. Cohnnliiciisc 90 



II. Aecia gregarious, arising frou) a limited mycelium: 



Host belonging to Scheuchzeriac(\ae 1. '/'rinluvliinis 1 



Host belonging to Melanthaccac 1. I'ndariac 2 



Host belonging to Liliaceae: 



Of the genus Leucocrinum A. sp. 'i 



Of the genus Anthericuni 4. sp. i 



Host J)olonging to C<)nvallariacoa(> A. Trillii 5 



