5 ENDOSPOREiE. [bKEFELDIA. 



?he complex structure of the capillitium is difficult to follow in 

 lower part of the Kthalium ; towards the surface the sporangia 

 often separated from each other by a narrow interval. The sides 

 the sporangia are then seen to glitter with the numberless vesicles 

 the capillitium. The threads penetrate the adjacent sporangia to 

 distance of 0-07 to 01 mm., or about half the radius. The entire 

 gth of the threads, including the central vesicle, is 0-15 to 0'23 mm. 

 3 spores in the central part of the sporangium do not seem to be 

 rersed by any threads. In the lower strata the threads are some- 

 es attached at each extremity to folds of the membrane arising 

 m the spongy base ; but the rigid coUumellse, throughout the upper 

 t at least, appear to be free from the capillitium. 



lab. On dead wood. — Lyme Eegis, Dorset (L:B.M.102) ; Darenth, 

 nt (B. M. 1110); Wanstead, Essex (L;B.M.102) ; Luton, Beds 

 B.M.102) ; near Birmingham (L:B.M.102) ; Boynton, Yorkshire 

 . M. 1159) ; France (Paris Herb.) ; Sweden (K. 781) ; Germany 

 rassb. Herb.) ; Mass., U.S.A. (L:B.M.102) ; Iowa (B. M. 1020). 



Rostafinshia australis Speg., in Ann. Soc. Cient. Argent., x., p. 151 

 180), is described as forming an aethalium and having the surface 

 nposed of softly velvety tomentum, breaking up into powdery 

 ,ments ; the capillitium tubes of the lower stratum septate ; the 

 )res lilac, ovoid or irregular, 8 to 10 x 5 to 6 /*. It does not appear 

 be a Mycetozoon. 



Cohort U.—LAMPWSPOEALES. Spores variously coloured, 

 ver violet. 



Bubcohort l.—ANEMINE^ Eost. (extended). Capillitium 

 fc forming a system of uniform threads; either wanting, or 

 presented by modifications of the sporangium-wall, which may 

 perforated or laciniated in sethalioid sporangia, or produced 

 ;o tubular extensions in exceptional forms in the order 

 'ihulinaceae. 



Order I. — HeteeodeemacejE Eost. (extended). Sporangium- 

 ill membranous, beset with microscopic round granules (plasmodic 

 anules), and, except in Lindbladia, forming a net in the upper 

 rt ; capillitium wanting ; spores 4 to 7 /* diam. 



KEY TO THE GENEEA OF HETEUODERMAGEJE. 



lorangia sessile, compacted or sethaKoid, the wall not forming a 

 net in the upper part. (22) Lindbladia 



Fig. 30. — Lindbladia Tuhulina Fries. 

 jEthalium. Natural size. 

 Vertical section of sethalium. Magnified 6 times. 



Fig. 80, 



