732 MINNESOTA BOTANICAL STUDIES. 



Eighteen species are reported from North America. The 

 most common is: 



Knyaria purpurea (L.) 



Tremella purpurea L. Spec. PI. 1158. 1753. 



Tubercular ia vulgaris Tode. Fung. Mecklenb. 1: 18. 1790. 



The Linnaean description clearly indicates this species, even 

 if Tode did not indirectly re'fer to the same species as a syn- 

 onym. 



Tuberculina Sacc. containing a number of species para- 

 sitic in Uredineae, is now generally placed in the Uspil 

 agineae. Some species, however, are of a different nature 

 from the typical Tuberculina, and are perhaps no more than 

 small Knyariece, e. g. T. solanicola E. & E. Journ. Myc. 

 ■ 7 : 278. 1893. 



Granularia Sacc. Mich. 2:648. 1882. is of a doubtful posi- 

 tion. The sporodochia (?) are globular, and composed of 

 compacted, filiform, hyaline hyphae. The surface of the 

 sporodochia is formed by the compact mass of hyphae, and 

 the interior is composed of hyphae and ovoid spores borne 

 acrogenously. A form of this character has no place in 

 this group. On account of Granularia Roth (1791), the 

 name cannot well be retained. 



Illosporium Mart. Fl. Crypt. Erl. 325. 1817. Contains a 

 number of forms growing on lichens, and some growing on 

 wood, dead stems, and even leaves. After investigating 

 some of the lichenicolous species pretty carefully, we are 

 satisfied that they are to be placed in Dr. Thaxter's group 

 of Myxobacteriaceae, if not in some cases identical with the 

 forms he has discovered/ 1 ) Several of the xylogenous spe- 

 cies appear to be of the same nature. The phyllogenous 

 forms seem to be of a different character, but we are not 

 concerned with them here. 



2. AEGERITA Pers. Tent. Disp. Meth. Fung. 40. 1797. 



Sporodochia subglobose, sessile, superficial, subfarinaceous 

 (on account of the conidia on the surface); conidiophores hyal- 

 ine or light colored, pallid, short, rather thick, simple or 

 slightly branched, sometimes obsolete; conidia rather large, 

 globose or ovoid, acrogenous or sub-acrogenous, continuous. 



Five species are reported from North America, of which 

 some are rather doubtful. 



(1) Compare also Zukal's Myxobotrysaceae (Bericht. Deutsch. Bot. Ges. 14:340. 1896), 

 which seems to be substantially the same group. 



