List of Mycetozoa, Basloiv. Gulielma Lister. 249 



enveloping cortex and showing distinctly the outlines of the 

 component sporangia, and Perichaena corticalis abundant on 

 the under surface of dead birch boughs lying among wet 

 grass. 



In Padley Wood, our lunching place, oaks clothed the steep 

 sides of a ravine down which a stream fell in small cascades 

 between fern-clad banks. Four species of Mycetozoa were 

 found here, all on fallen boughs of oak: they were, Comatricha 

 nigra, a minute form, Arcyria nutans, A. pomiformis and Licea 

 pusilla; the sporangia of the last named species were, as usual, 

 small and incons])icuous, matching in colour the dark decorti- 

 cated wood on which they had developed. The spores proved 

 to be unusually small, measuring 12 to i^^i, instead of 16 to 20/li, 

 but were typical in colour and marking, being olive grey and very 

 minutely warted all over. vStoke Wood formed a narrow strip 

 beside the river Derwent, and consisted of sycamore and poplar 

 with an undergrowth of dog's mercury, elder and rhododendrons. 

 Of the three species found here the most striking was Comatricha 

 nigra var. alia which formed conspicuous reddish brown patches 

 extending over an area of six by twenty-four inches on the side 

 of an old fencing plank : most of the sporangia were cylindrical 

 on long slender stalks, but among them were globose sporangia 

 with shorter stalks ; the capillitium in all consisted of a tangle 

 of sparingly branched fiexuose threads attached chiefly to the 

 base of the columella. 



On September 25th we visited the timber yard and explored 

 the woods and gardens of Chatsworth. Seventeen species were 

 obtained, of which ten were found in the timber yard. Here 

 Fuligo septica was very abundant on old pine trunks, and also 

 Arcyria nutans. Physarum psittacinum and Stemonitis ferru- 

 ginea were also found on these logs, in good condition ; both are 

 new records for Derbyshire. The fine old oaks, survivors of the 

 giants of Sherwood Forest, scattered over grassy and bracken- 

 covered slopes, yielded two interesting Mycetozoa, viz. Cribraria 

 rufa, a species rarely found on any but coniferous wood, and a 

 form of Liceopsis lobata having some sporangia stalked, globose 

 and free, and others sessile and closely clustered. 



Rough slopes of peaty soil above the Chatsworth gardens, 

 clothed with cushion-like growths of the moss Campylopus 

 pyriformis, recalled similar habitats in Epping Forest where 

 Colloderma oculatum had repeatedly been obtained. No trace 

 of this species was found at the time, but lumps of the mossy 

 soil were brought away and kept moist; after a fortnight a 

 sporangium of Colloderma made its appearance and was soon 

 followed by others until after two months over thirty sporangia 

 had developed. 



