190 MICROSCOPIC FUNGI. 



rEETDEiiiinjM, Chev. 



Teridium elongated, at length bursting irregularly. Spermo- 

 go?iia scattered, conspicuous. 



Peridermmm Pini, Chev. ; pcridia oblong, scattered, 

 1 -rge; spores orange, abundant; spermogonia vernal or autumnal, 

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

 cf Scotch Fir. Coinuion in Scotland, occasional in England. 

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



PeridermiurQ elatinum, Lk. ; simple, immersed ; peridia 

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

 Ibliage and ramification. Not common. 



-^ciDiUM, Pers. 



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

 rounded by a fringe of recurved teeth, or when short 

 bursting irregularly. Spores 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). 



.3]cidium leucospermum, 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.) 



-Slcidium quadrifldum, DC. Four-lobed Clustek- 

 Cups ; spots browTiish ; 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. 



.iEcidium albescens, Grev. Moschatel Cluster-Cups ; 

 leaf blistered, whitish, scattered ; peridia white, spUt into a few_ 

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

 Adoxa moschatellina. Not uncommon. April. 



. ^cidium Epilobii, DC. Willow-herb Clusteu-Cups ; 

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

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

 Epilobium montanum, E. hirsutum, and E. palustre, rarely on the 

 upper. Common. June to August. 



^cidium Thesii, Desv. Bastahd-toadplax Clustee- 

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

 cylindrical, margin irregularly toothed, erect ; spores yellowish, 

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

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

 50, 51.) 



