M ICROSPH AERA 161 



was not accompanied by a diagnosis, and therefore cannot take 

 precedence over Leveille*s name Mougcotii (1851). 



7. M. DIFFUSA Cooke & Peck. [Figs. 31-33] 



M. diffusa Cooke & Peck, Journ. of Bot. IL i : 13. 1872 ; 

 Peck, Reg. Rep. 25 : 95. 1873 ; Sacc. SylL Fung. 1:12. 1882 ; 

 Burr. & Earle, Bull. Ill State Lab. Nat. Hist 2: 416. 1887; 

 Atkins. Journ. Elisha Mitch. Sci. Soc. 7 : 69. 1891 ; Burr.; Ell. & 

 Everh. N. Amer, Pyren. 24. 1S9 



M. symphoricarpi E. C. Howe, Bull. Torr. Club, 5 : 3. 1874 • 

 Burr. & Earle, Bull 111. State Lab. Nat. Hist. 2: 417. 1887; 

 Sacc. SylL P^ung. 9 : 369. 1891 ; Burr.; Ell. & Everh. N. Amer. 

 Pyren. 24. 1892. 



Exsicc. (sub M. diffusa) : Ell. & Everh. N. Amer. Fung, 

 sec. ser. 1540; Rab.-Wint. Fung. Eur. 3654; Ra v. Fung. Amer. 

 Exsicc. 628. (Sub 3f. symphoricarpi); Rab.-Wint. Fung. Eur. 

 3655; Ell. N. Amer. Fung, j^% ) Rehm. Ascom. 846; *E1L & 

 Everh. Fung. Columb. 224. 



Amphigenous ; mycelium persistent, thin and effused, or sub- 

 persistent and forming vague patches, or quite ev^anescent ; peri- 

 thecia scattered or gregarious, globose-depressed, very variable in 

 size, 55~i^6// in diameter, averaging 90-100 fx, cells 10-20 fi 

 wide ; appendages very variable in number and length, 4—30, or 

 rarely crowded and as many as 50, 1^-7 times the diameter of 

 the perithecium, smooth, aseptate or 1—3 -septate in the lower half, 

 colorless or pale brown towards the base, flaccid when long, thin- 

 walled above, becoming thick-walled towards base, apex 3-5 times 

 dichotomously or sub-dichotomously divided, branching diffuse 

 and irregular, branches of the higher orders sub-nodulose, often 



apparently lateral, tips of ultimate branches not recurved ; asci 

 4-9, 48-60 X 28-30 //, ovate-oblong with a very short stalk ; 

 spores 3-6, usually 4, 18-22 x 9-1 1 /^ 



Hosts, — (Sub M. diffusa) Apios tiibcrosa^ Dcsmodiuni Cana- 

 dense, Z>. ca^icsccns {26$) (324) 366), D. cuspidatum {6\), D, pan- 

 iadatum^ D. sessilifoliuvi, Glycyrrhiza hpidota, Lcspedcza capitata, 

 L. Jiirta, Z. striata^ L. violacca^ Phascolus pcrcnnis, (Sub liL 

 symphoricarpi) Symphoricarpos occidentalism S. orbiculatus, S. race- 

 inosns and var. paucifiorus (6). 



Distjibution. — North America : United States (sub M. diffusa) 

 — Connecticut, New York, Pennsylvania, South Carolina, Ohio 



