MiCROSPHAERA 1G3 



in Professor Earle's Herbarium — the identity in the nature of the 

 apical branching of the form on Symphoricarpos and of M. diffusa 



on other hosts is clearly seen. 



Burrill (60) remarks on " M. symphoricarpi (which is given 

 specific rank)" ; " much like some forms of J^ vaccinii:' The lat- 

 ter plant is, however, far removed in the distinctly recurved tips of 

 the ultimate branches of the apex of the appendages. 



M. diffusa has been recorded on Lathy rus ochrolcucus by 

 Burrill (60) and Trelease ( 366). From the remarks of the latter 

 author, however, that the appendages were " absolutely indistm- 

 guishable from those of M. puhhra " there can be no doubt that 

 the fungus was really M. abii. Vicia is also given as a host-plant 

 by Burrill (60) for the present species, but it seems probable that 

 M. alni, var. ludcns has been mistaken for M. diffusa in this case. 

 I have seen specimens of typical M. alni on both Lathyrus ochro- 

 lcucus and Vicia Americana. 



The records of M. Along 

 belong to the present species 



America 



8. M. RussELLii Clinton. [Figs. 38, 39] 



M. Russcllii CWnion ; Peck, Reg. Rep. 26 : 80. 1874 ; Sacc. 

 Syll. Fung, i: 12. 1882 ; Burr. & Earle, Bull. 111. State Lab. 

 Nat. Hist. 2:415- 18S7 ; Burr.; Ell. & Everh. N. Amer. Pyren. 



23. 1892. 



ICC. 



: Ell. & Everh. N. Amer. Fung. sec. sen 2008, 3 5^7 ; 

 *Seym. & Earle, Econ. Fung. 270a, 270b ;* Ell. & Everh. Fung. 



Columb. 507. 



Amphigenous; mycelium evanescent, or subpersistent ; pen- 

 thecia scattered, 70-118 a in diameter, globose-depressed, cells 



the perithecium, flaccid, septate, smooth, colored nearly to the apex 

 when mature, apex 2-4 times dichotomously branched, branchmg 

 very irrecrular and lax, primary branches usually long and torking 

 widely, tips of ultimate branches not recurved ; asci 4-9, narrovv y 

 to broadly ovate, or (in small perithecia) ovate -globose, shortly 

 stalked, 42-56 X 24-3 2 ^ ; spores 3-5, usually 4, 18-22 x ic^ 



Hosts.— Oxal is connculata, var. stricta, 0. Suksdorfii, 0. violacca 

 (60). 



