200 ENDOSPORE^. [PERICH^NA. 



former having a double and the latter a single sporangium-wall ; but 

 this character is inconstant, as mentioned in the text. The specimen 

 from Ellis, No. 726, N. Am. Fungi (K. 990), originally named P. 

 Friesiana, and then 0. umbrina, resembles the Lyme Regis gatherings 

 and Rostafinski's description of his German types of P. variahilis. The 

 specimen from Ellis and that from Lyme Regis (K. 991) are given as 

 the types of a new species, P. confusa Mass. ; but surely on insufficient 

 grounds. The type of Licea reticulata Berk. & Br., from Ceylon 

 (L:B.M.166) is also P. variahilis ; the sporangia consist of minute pale 

 umber, net-like plasmodiocarps, some of which have very scanty 

 capillitium, but in others it is more abundant and of the usual 

 minutely warted type ; the spores are closely and minutely warted 

 and measure 11 to 15 fi.. In all the specimens enumerated above, the 

 inner layer of the sporangium- wall is minutely papillose, a character 

 by which this species of Periahcena is distinguished from all others. 



Hab. On dead leaves, wood, etc. — Lyme Regis, Dorset (L:B.M.166) ; 

 Batheaston (B. M. 310, 311) ; Luton, Beds (L:B.M.166) ; Ceylon 

 (L:B.M.166); New Jersey (K. 990); PhUadelphia (L:B.M.166); 

 N. Carolina (K. 1671, 1705) ; S. Carolina (B. M. 953). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



5. Perichsena Eostafinskii Karst., in Bidr. Kann. Finl. ISTat. 

 (1879), p. 130. Sporangia scattered and subgregarious, sessile, 

 globose, yellowish-brown, shining. Capillitium wanting. Spores 

 globose, almost smooth, dark or blackish brown, brownish under 

 the microscope, 10 to 27 /a diam. 



Hah. On moss and dead leaves. — Finland. 



This description suggests an imperfect development of P. popuUna. 



6. P. microcarpa Schroet., Krypt. El. Schles., p. 108 (1885). 

 Sporangia solitary or in small groups, subglobose, 0'5 mm. diam., 

 more rarely irregular, depressed, yellowish-brown, smooth, 

 opaque, dehiscing irregularly; capillitium abundant, forming a 

 regular lax net of yellow threads, 1-5 to 2 /a diam., somewhat 

 wider at the angles. Spores golden-yellow, strongly spinose, 

 15 to 17 /J, diam. 



ffab. On dead leaves. — Breslau, Silesia. 



7. P. pallida Berl., in Sacc., Syll., vii., p. 422. Sporangia 

 gregarious, pale tan-coloured; spores yellow, but paler than in 

 P. australis. — Stegasma pallida Cesati, Atti Accad. So. Fis. Mat., 

 viii., p. 12 (1879). 



Hah. Sarawak, Borneo. 



This description is too brief to be of use. 



8. P. canoflavescens Raunk., in Bot. Tidssk. (1888), p. 54. 

 Sporangia clustered on a thin yellow-grey hypothallus, globose, 

 hemispherical or reniform, sessile, 0-5 mm. diam., bright yellow- 

 grey, dehiscing more or less regularly with a Kd; the wall 



