371 



New or Rare British Fungi. 



By Ernest S. Salmon, F.L.S. 



{Read May ISth, 1900.) 



Plate 20. 



Microsphsera Baumleri P. Magn. (Figs. 1 — 3). 



31. Baumleri P. Magn. Bericht. Deutsch. Botan. Gesell. xvii., 

 148, Taf. ix., ff. 17, 18 (1899). 



M. marchica P. Magn. Ic. 149, Taf. ix., f. 19 (1899). 



Exsicc. Rehm, Ascom. 249 (sub Erijsiphe Martii). 



Hypophyllous (very rarely amphigenous), mycelium subper- 

 sistent or evanescent ; perithecia more or less densely gregarious 

 in floccose patches covering the surface of the leaf, globose - 

 depressed, becoming hemispherical, 80 — 150 jx in diameter, 

 appendages 8 — 20, usually 8 — 14, 4 — 6 times the diameter of the 

 perithecium, flaccid, penicillate when mature, smooth or slightly 

 rough, colourless, hyaline and delicate above, becoming retractive 

 towards the base, apex about three times dichotomously branched 

 when mature, branching vague and lax, branches of the higher 

 orders more or less irregularly placed, tips of the ultimate 

 branches not recurved, asci 4 — 12, ovate to oblong, usually 

 shortly stalked, 55 — 70 x 30 — 38 /x., spores 4 — 6 (8 recorded 

 by Magnus), 20—22 x 10—12 /x. 



JouRN. Q. M. C, Series II.— No. 47. 27 



