65 
early stage, the contents of the peridia often oozing out like 
drops of blood. A small, flat variety occurs on rotten sticks 
of Rubus fruticosus at Batheaston, but it seems identical in 
structure. L. parietinum Fr. grows on damp paper, &c., 
but it has not occurred in our district. 
GENUS 76. RETICULARIA.* BULL. 
Peridium indeterminate, simple, thin, bursting irregularly, 
fugitive. Flocci attached to the peridium, flat, branched or 
somewhat reticulate. : 
1.—Reticularia umbrina Fr. Sow. t 272. Bt8. Leigh Woods, 
Bristol, on stumps. The three other species recorded as 
British have not occurred in our locality. 
GENUS 77. ZTHALIUM. ft LK. 
Peridium indeterminate, covered with a floccose evanescent bark, 
cellulur within from the interwoven flocci. 
1.—ABthalium septicum Fr. on rotten wood at Freshford, this 
species is common in most localities but has not been much 
observed here. Aithalium vaporarium Fr. grows on tan in 
stoves but has not occurred to me in our district. . 
GENUS 78. SPUMARIA.{ FR. 
Peridium indeterminate, simple, crustaceous, cellular, spores 
surrounded by membranaceous, sinuous folds. 
1—Spumaria alba Dc. common on living grass. The only species, 
GENUS 79. PTYCHOGASTER.§ CORDA. 
Peridium thick, fleshy, slightly stalked or sessile, cellular within, 
the strata of cells irregular, fertile and sterile mixed ; spores 
* Reticularia from reticulum a little net. 
+ ABthalium from aithale soot, owing to the black mass of spores covering 
surrounding bodies. 
+ Spumaria from spuma foam, it resembles froth in its early stage. 
§ Ptychogaster from ptuchos a fold, and gaster a stomach, 
E 
