Report on the Mycetozoa found during the Foray at Keswick. 13 



valley connecting Bassenthwaite and Derwentwater appeared 

 to be the most favourable hunting grounds for Mycetozoa, 

 whereas the igneous rocks \nth a natural swiit drainage, excessive 

 wetness, and Httle depth of soil, may be regarded as unfavour- 

 able to their development. The arboreal vegetation was generally 

 of small size and with very Httle undergrowth. Here and there 

 a copse of hajzel could be seen. The trees were mostly conifers, 

 larch being predominant. Beech and oak occurred in a few 

 places in the valley and the holm oak was well represented. 

 Birch also was plentiful in places, particularly at the base of 

 the hills, but elm was almost entirely absent. 



In the following hst of thirty-seven species it may be observed 

 there is no record of Badhamia and that the prolific genus of 

 Physarum is only represented by two species; most of these 

 gatherings were deficient in lime. In the \-icinity of the Falls 

 of Lodore Leocarpus fragilis was taken in all stages of de- 

 velopment. Physarum viride, Trichia persimilis, and Trichia 

 Botrytis were also found here in quantity. The Trichiaceae are 

 well represented in the Hst. It seems that the Hme-forming 

 species are not so happy in their development in these sur- 

 roundings as is the case with the Trichiaceae and Arcyriaceae 

 and those other species that are destitute of lime for it may be 

 observed that the Calcarineae are represented by only eleven 

 species in this Hst. 



In the foUomng list J. =Thirlmere; L. =Latrigg; S =Borrowdale; Ba.= 

 Bassenthwaite; IF. =^^^linlate^ and Wythop. 

 Ceratiomj-xa fruticulosa Macbr., B., W. A beautiful gathering in course of 



development had been entirely devoured next morning by the larvae of 



Phronia basalis Winn, a dipterous Q.y of the family IMycetophihdae. A 



species of Collembola also attacks it with avidity. 

 Physarum nutans Pers., T., B., W. (a slender form was taken in several places), 



var. leucopheum Lister, B. (this was taken in the valley). 

 P. viride Pers., L., B., var. aurantium Lister, B. 

 Fuhgo septica Gmel., T. One gathering only. 

 Craterium minutum Fr., B., IF. 

 Leocarpus fragihs Rost., T., B., Ba. All gatherings had dark purple brown 



sporangia. 

 Diderma deplanatum Lister, T. 

 Didymium melanospermum Macbr., T., nigripes Fr., B., squamulosum Fr., L., 



difiorme Dub)-, T. 

 Lepidoderma tigrinum Rost., B. Developed from orange plasmodium found on 



damp moss near the Falls of Lodore, the accurately formed stellate scales 



attached to the sporangium wall in some cases were ver\- conspicuous. 

 Stemonitis fusca Roth., T., flavogenita Jahn, B , Ba. 

 Comatricha nigra Schroet., B., pulchella Rost., B., laxa Rost., B., typhoides 



Rost., r., L., B. (the stalk and cylindrical sporangia were devoid of the 



silvery outer gro\\i;h) . 

 Lamproderma columbinum Rost. var. iridescens G. List.*- 

 Cribraria vulgaris Schrad., B. 

 Licea flexuosa Pers., B. Taken by Mr Knight shewing the outer mottled coat 



of refuse matter very clearly. 



* See p. 32. 



