100 THE JOURNAL OF BOTANY 



seems to be the first true record of the species for Switzerland, 

 for in the light of our present knowledge the previous Swiss 

 records should be referred to B. aliyina. 



Physarum viride (Bull.) Pars. One gathering only, on a 

 spruce cone in the woods. 



P. NUTANS Pers. A single specimen found in the hollow of a 

 spruce stump. 



P. FULVUM (Macbr.) Lister. A cluster of about fifty sporangia 

 was found on a pile of spruce boughs in a steep wood. Except 

 for a gathering made by M. Charles Meylan on Le Chasseron, 

 Jura Mts, last May, this alpine species has not been found out of 

 N. America, where it appears to be rare. M. Meylan's specimen, 

 part of which he kindly sent me, has more globose and sessile 

 sporangia than the type from Colorado (figured in Mycetozoa, 

 pi. 66) ; they vary from yellowish -buff to white, or are yellow 

 below and white above ; the lime-knots of the elastic capillitium 

 are yellow and often unite to form a pseudo-columella. In the 

 Arosa specimen the sporangia are obovoid on long or short yellow 

 membranous stalks ; some are yellowish-chestnut, others are 

 bright yellow all over, or yellow below and white above where the 

 wall breaks up into fragile lobes ; the capillitium consists of 

 an elastic network of yellow threads with numerous orange or 

 orange-red angular lime-knots, containing irregular nodules of 

 lime; the spores are rich brownish-purple, spinulose, 11-12 /x 

 diam. This specimen shows a striking resemblance to Leocarjms 

 fragilis Rost. both in the shape of the sporangia and in the 

 capillitium and spores ; but although the colour of the sporangia 

 varies in both these species, the walls of P.fulviim are membranous 

 and rugose with included deposits of lime-granules, and show 

 nothing of the polished cartilaginous layers characteristic of 

 Leocarpus fragilis. 



P. VERNUM Somm. On Cirsiiim scapes. 



FuLiGO SEPTiCA (L.) Gmelin. One weathered sethalium found 

 on a spruce stump. 



DiDERMA NivEUM (Rost.) Macbr. Found in abundance, but 

 mostly in a weathered condition, on turf near melting snow. 



D. Trevelyani (Grev.) Fries. Two clusters found on Cirsium 

 scapes on the alps. The sporangia show no trace of columellae. 



D. radiatum (L.) Lister. A curious development consisting 

 of a dozen brownish-buff sporangia was found on a chip of spruce 

 wood. They are sessile or on very short flesh-coloured stalks, or 

 form short curved plasmodiocarps. The lime-granules are dis- 

 solved from the cartilaginous sporangium-\valls which are marked 

 with the cavities where the granules lay ; the columella is 

 hemispherical, the capillitium colourless, and the spores purple- 

 brown, 8 to 11 /x diam. I have since received specimens of 

 typical stalked D. radiatum gathered at Arosa in August by the 

 Hon. Terence Bourke. 



DiDYMiUM DiFFORME (Pers.) Duby. Both large and small 



