64 Mycefozoa of the Austwick district. 



obviously there must be plenty of food material for all. With 

 careful searching even the more uncommon species can be 

 counted on with a fair degree of certainty, at the proper season, 

 and in the situations most suitable for them. This applies 

 to such as the three species of Dianema : — Dianema Harveyii 

 Rex., D. depressum Lister, and D. coriicatum Lister. On two 

 successive days, Mr. Cheetham and I have found all three 

 species. 



A perusal of the list appended will show that of the 60 

 species, two thirds (66 per cent.) belong to the non-calcarineae,. 

 i.e., those species which do not contain lime in the mature 

 sporangia or stalk (if present). This is perhaps largely ac- 

 counted for by the fact that by far the larger proportion are 

 from dead wood rather than from straw, leaves, etc., on which 

 a large number of the common lime forms occur. It is perhaps 

 possible too, that even the so-called non-calcarineae may in 

 the Plasmodium state contain lime salts, which are passed out 

 from the plasmodium previous to fruiting, i.e., just before the 

 last stage in the life-cycle is commenced, whereas in the cal- 

 carinese this operation takes place during the final stage in the 

 life history of the organisms, and is therefore manifest in the 

 sporangia or capillitium or both. 



SPECIES OF MYCETOZOA FROM AUSTWICK DISTRICT. 



Ceratiomyxa fruticulosa Macbr. Ash and Pine. 



Badhamia utricularis Berk. On Polystictus versicolor. 



B. panicea Rost. On Beech. 



B. lilacina Rost. On grass (Red Moss) and sedges. 



Physarum psittacinum Ditm. On Sycamore, Fern leaves. 



P. viride Pers. On Sycamore. 



P. nutans Pers. On dead wood leaves. 



P. leucophcBum Lister. On dead wood. 



P. compressum Alb. & Schw. On grass. 



Fidigo septica Gmelin. On Oak, grass. 



Craterium minutum Fries. On leaves and grass. 



Leocarpus fragilis Rost. On grass. 



Diderma hemisphericum Hornem. On Sycamore and Oak twigs. 



D. effusum Morh. On leaves and grass. 



D. spumaroides Fries. On leaves and grass. 



Didymium dijforme Duby. On twigs, leaves and grass. 



D. melanospermum Macbr. On Empetrum (Red Moss). 



D. sqiiamulosum Fr. On straw and grass. 



Mucilago spongiosa Morgan. On grass, Helwith Moss. 



Lepidoderma tigrinum Rost. On Birch. 



Stemonitis jusca Roth. On Ash and Pine. 



S. fusca var. confluens Lister. On Oak. 



5. flarogenita Jahn. On Ash. 



Naturalist, 



