200 
ENDOSPORE^E. 
[pERICIIiENA. 
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. variabilis. The 
specimen from Ellis and that from Lyme Regis (K. 991J 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. variabilis ; 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 /x. In all the specimens enumerated above, the 
inner layer of the sporangium- wall is minutely papillose, a character 
by which this species of Perichoena 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); Philadelphia (L:B.M.166); 
N. Carolina (K. 1671, 1705) ; S. Carolina (B. M. 953). 
SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 
5. Perichsena Rostafinskii Karst., in Bidr. Kann. Finl. Nat. 
(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. 
Hab. On moss and dead leaves. — Finland. 
This description suggests an imperfect development of P. populina. 
6. P. microcarpa Schi-oet., Krypt. Fl. 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 /A diam. 
Hab. 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. Sc. Fis. Mat., 
viii., p. 12 (1879). 
Hab. Sarawak, Borneo. 
This description is too brief to be of use. 
8. P. canoflavescens Eaunk., 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 i-egularly with a lid ; the wall 
