MYCETOZOA FROM AROSA, SWITZERLAND 103 



deep red instead of brown ; in some sporangia the ribs branch and 

 anastomose to form a Cribraria-\ike net, in others the ribs send off 

 obhque branches on either side, as in Schrader's ilkistration of 

 Dictydium venosuvi.''- 



LiCEA FLEXUOSA Pors. Found developing from rosy Plasmo- 

 dium and also in a mature condition on spruce stumps and boughs. 



L. MINIMA Fries. Abundant on a few much decayed spruce 

 stumps. The sulphur-yellow plasmodium continues to emerge 

 and form sporangia for some days over the same area of wood, so 

 that one may find all stages of growth intermixed, varying in 

 colour from yellow to bright chestnut or brownish-black. The dark 

 granules dotted over the inner surface of the margins of the lobes 

 of the sporangium walls are not free " plasmodic granules " such 

 as we see in Gribraria, Dicttjdiwn and Lindhladia, but prominent, 

 often irregular warts or outgrowths from the walls themselves. 



L. pusiLLA Schrad. Fairly abundant on decayed spruce 

 stumps. The colour of the emerging plasmodium is watery drab. 

 I am not aware that this has been recorded before. When the 

 sporangia are still young and pale the outlines of the areolae 

 and lobes into which their walls will ultimately divide are clearly 

 defined as a net of dark lines. This species can be distinguished 

 from L. minima in the field by the spores being black instead of 

 a reddish-brown colour in mass. 



TuBiFERA FERRUGiNOSA Gmelin. A cluster of sporangia was 

 found emerging from a spruce stump in pinkish-yellow plasmo- 

 dium, which matured indoors. 



Lycogala epidendrum (L.) Fries. On spruce stumps. 



Trichia pavoginea (Batsch) Pers. Abundant on spruce logs 

 and stumps. The elaters in some sporangia have the spiral bands 

 replaced partially by ring-shaped thickenings. 



T. scABRA Rost. Two large developments were found on 

 spruce logs. 



T. persimilis Karst. On spruce stumps. 



T. VARiA Pers. Abundant on wood. 



T. coNTORTA (Ditm.) Rost. var. alpina. On Cirsiwn scapes. 



T. DECiPiBNS (Pers.) Macbr. On spruce stumps. 



T. BoTRYTis Pers. On spruce logs and stumps. 



Hemitrichia Karstenii Rost. A group of brown sporangia 

 was found on a heap of spruce boughs. 



H. abietina (Wig.) Lister. On decaying spruce. The bands 

 on the capillitium are two or three, arranged in a loose spiral, and 

 often interrupted by ring-shaped thickenings. 



H. leiotricha Lister. A single shortly-stalked sporangium was 

 found on a chip of spruce wood. The structure of the sporan- 

 gium-wall with its comma- or ring-shaped thickenings and deposits 

 of olivaceous refuse matter and the colour and markings of the 

 spores are typical. The capillitium is remarkable in having the 



* See Nova Genera Plcmtarum, pi. iii. fig. 6. 



