MYCETOZOA OF ANTIGUA AND DOMINICA. 117 



12. Physarum calidris List. On fibrous tissue (palm leaves?), 

 Antigua. There are four gatherings of this species. The sporangia 

 are either smooth or rugose on red stalks ; they show variation in 

 the capillitium from the Badhamia to the Physarum type such as 

 are met with in England. 



13. Physarum compressum Alb. & Schw. On dead leaves and 

 sticks, Antigua. Two gatherings of the typical form, with com- 

 pressed simple or lobed sporangia on grey stalks. 



14. Physarum pallidum List. (syn. Diderma pallidum, Berk. & 

 Curt.) (PI. 385, fig. 1, a, b, c ). On leaves, Antigua. Mr. Cran has 

 sent five gatherings of this species. The sporangia vary in colour 

 from reddish brown to buff, bright yellow or nearly white ; they are 

 sessile on a narrow elongated base, either ovoid and somewhat 

 angular, or flexuose terete plasmodiocarps ; the outer sporangium- 

 wall is smooth, and densely charged with white lime on the inner 

 side ; it is usually areolated more or less closely with pale lines, 

 and along these lines it breaks and separates in reflexed lobes from 

 the persistent membranous inner wall ; the capillitium consists of 

 numerous white lime-knots connected by slender hyaline threads ; 

 the spores are 8 fx diam., nearly smooth, pale violet-brown, resembling 

 those of P. nutans. The species is represented in the Kew Collection 

 by a specimen from South Carolina marked Diderma pallidum Berk. 

 & Curt. No. 1972, and in the British Museum Collection by one 

 from Eavenel under the same name ; there are other specimens 

 also in the British Museum from South Carolina, Georgia, and 

 Brisbane, marked " Physarum,'" ^' Bidyvmim Serpida,'' and ^'Aijgi- 

 ordium valvatum." Diderma pallidum is mentioned by Berkeley in 

 Grevillea, ii. 52, under "Notices of North American Fungi," and 

 reference is made to the specimen No. 1972, but he does not describe 

 it, and no previous record of the name can be traced. Although it 

 is undoubtedly a distinct species, Eostafinski gave Diderma pallidum 

 as a synonym for Physarum bivalve, one of its nearest allies ; from 

 the crushed state of the herbarium specimens he would have had 

 difficulty in making out the general characters, and the difference 

 of the paler and smoother spores seems to have escaped his notice, 

 as it did my own on the first examination of these specimens. 

 There are specimens of P. bivalve from South Carolina in the 

 British Museum, but Mr. Cran has not yet met with this species in 

 Antigua. Prof. Penzig has collected both P. bivalve and P. pallidum 

 in Java. 



15. Physarum murinum List. var. /? ^neum, n. var. (PI. 385, fig. 4, 

 a, b, c). On palm-leaf, Dominica. The single gathering consists 

 of a few elUpsoid sporangia, and a number of branching or anasto- 

 mosing plasmodiocarps. The species has hitherto been only obtained 

 from Scotland, Sweden, and the United States ; and the Dominica 

 specimen differs from all previous examples in several particulars. 

 The general colour under a pocket-lens is dull bronze as compared 

 with the usual pinkish brown ; the sporangium -wall is of two layers, 

 contrasting with the single wall of former specimens ; the outer 

 layer separates and folds back from the inner, especially in the 



