190 MICROSCOPIC rUNGI. 



Peuidermium, Chev, 



Peridium elongated, at length bursting irregularly. Spermo- 

 gonia scattered, conspicuous. 



Peridermiuin Pini, Chev. ; peridia oblong, scattered, 

 large; spores orange, abundant ; spermogonia vernal or autumnal, 

 or both ; spermatia large, white. — On leaves and young branches 

 of Scotch Fir. Common in Scotland, occasional in England. 

 Summer. (Plate II. figs. 27, 28.) 



Peridermium elatinum, Lk. ; simple, immersed ; peridia 

 elliptic, pallid ; sporidia orange. — On Silver Mr, altering both 

 foliage and ramification. Not common. 



^CIDIUM, Fers, 



FericUum seldom elongated, opening by a terminal mouth, sur- 

 rounded by a fringe of recurved teeth, or when short 

 bursting irregularly. Spoi^es disposed in chains. Spermo- 

 gonia on the same or the ^ opposite surface, clustered or 

 scattered, central or intermixed. 



Sect. I. — Peridia scattered {not collected in tufts or clusters), 



.fficidium leucospermiim, DC. White-spoeed Cluster- 

 Cups ; spots yellowish ; peridia scattered, often covering the 

 whole under surface ; spores white, ovate. — On both sides of 

 the leaves of the Wood Anemone. Common. June. (Plate I. 

 figs. 4—6.) 



.fficidium quadrifldum, DC. Pour-lobed Cluster- 

 Cups ; spots brownish ; peridia scattered, occupying almost the 

 entire under surface ; spores brown, subglobose. — On the under 

 side of leaves of Anemone in gardens. ^ (Lobes at the mouth of 

 the peridium not constantly four.) April to May. 



jScidium albescens, Grev. Moschatel Cluster-Cups ; 

 leaf blistered, whitish, scattered ; peridia white, split into a few 

 large teeth ; spores yellowish- white. — On leaves and petioles of 

 Adoxa moscliatellina. Not uncommon. April. 



iEcidmm Spilobii, DC. Willow-herb Cluster-Cups; 

 spots obliterated ; peridia scattered, at length oval, wider above ; 

 spores orange, at length brown. — On the under side of leaves of 

 Epilohium montanum, E. hirsutum, and E. pahistre, rarely on the 

 upper. Common. June to August. 



^cidiiim Thesii, Desv. Eastard-toadplax Cluster- 

 Cups; spots obliterated; peridia scattered or biseriate; short, 

 cylindrical, margin irregularly toothed, erect ; spores yellowish, 

 then dingy. — On Thesium htimifimim. Downs near Winchester. 

 July, 1864 Chipstead, Surrey, Oct. 14, 1864 (Plate 111. figs. 

 50, '51.) 



