107 



Perichaena Fries. 

 Perichanella subgen. nov. 

 Sporangia sessile or with a short stem. Wall single, yel- 

 lowish, sometimes greyish- violet , homogen or containing plenty 

 of yellow-brown particles. 



P. cano-flavescens , sp. nov. Tab. 2, fig. 10. 



Sporangia gregarious, standing on a thin yellow-grey hypo- 

 thallus, globose to hemispherical or lengthened to reniform, ses- 

 sile, c. 0.5 mm. broad, bright yellow-grey, splitting more or less 

 regularly with a lid. The wall contains numerous round or an- 

 gulate particles. The upper part of the wall on its inner side 

 provided with delicate thickenings combined into a regular net- 

 work; meshes of the network 5 — 6-gonal and c. 12 ^ diam. 

 Gapillitium scarcely evident, only consisting of few slightly bran- 

 ched or quite unbranched threads of variable width, inequally 

 warted, colourless— yellowish ; without regard to the thickenings the 

 tubes are 1 .5 — 2 broad. Spores golden yellow, delicately war- 

 ted, 12.5 — 14 diam. 



On bark of beech. — Summer. Lolland. 



P. nit ens, sp. nov. Tab. 2, fig. 11. 



Sporangia single or few gathered in clusters, globose- 

 pyriform, sessile or with a short stem, splitting irregularly, 

 greyish brown with a fine violet tone of a metallic lustre, c. 

 0.5 mm. broad. Wall single, almost without particles. Tubes 

 of the capillitium long, shghtly branched, by irregular enlarge- 

 ments fastened to the wall, inequally and very dehcate spinu- 

 lose, equally broad throughout, 1 — 1,5 broad. Spores deh- 

 cately spinulose, as the tubes of the capillitium yellowish— hyaline, 

 10—12 fÅ diam. 



On bark of oak and fir and on decayed leaves of pine. — 

 Autumn. Sealand and Jutland. 



Arcyria cinerea (Bull.) var. cribroides. 



Tubes of the capillitium broader than those of the main 

 species; the inner meshes equal and of ordinary width, on the 

 surface of the capillitium on the contrary groups of very small 

 meshes and single larger succeed eacli other alternately. 



On decayed branches of fir. — Autumn. Near Copenhagen. 



