100 THE JOURNAL OF BOTANY 



thick-walled with a narrow lumen, and are so numerous that they 

 form a dense felt, ten or twelve series thick, which binds the 

 athalium firmly to the wood on which it rests. A similar felt may 

 be developed at the base of the gethalium in L. epidendrum, 

 and walls may be further thickened by many layers of rounded 

 vesicles ; these not only penetrate between the adjacent cells 

 of the wood, but occur also in the cavities of the wood cells. 

 These cysts or vesicles were obviously developed from those 

 veins of plasmodium that failed to become included within the 

 sethalium when it was first formed. Somewhat similar cysts are 

 sometimes found at the bases of sporangia of other species when 

 they have matured rapidly in dry weather. 



Trichia favoginea Pers. L. — T. persiviilis Karsten. L., H., 

 K., M.—T. ajfinis DeBary. L.— T. contorta (Ditmar) Eost. H. 



Trichia contorta var. alpinum E. E. Fries. M. The in- 

 conspicuous vermiform sporangia of this robust alpine form were 

 abundant on the dead scapes of Cirsium spinosissimum on the 

 alps above Miirren, and were also found on old herbaceous stems 

 in the spruce woods. They vary in colour from reddish-brown to 

 black ; in the brown sporangia the wall consists of a single layer 

 without external deposits of refuse matter, and is often embossed 

 by the impression of the spores ; the black sporangia have a stout, 

 cartilaginous, rich brown outer wall, thickened with deposits of 

 refuse matter, and an almost colourless membranous inner wall. 

 The elaters are bright yellow ; the spores measure from 15 to 18 fx 

 diam. The crystals of calcium-oxalate which are usually present 

 among the deposits on the sporangium-walls of typical T. contorta 

 do not seem to occur in the var. alpinum. 



TricJiia decipiens (Pers.) Macbr. E., M. — T. Botrytis Pers. M. 

 — T. Botrytis var. later itia. L. 



Hemitrichia abietina (Wigand) Lister. M. Found on old 

 fencing and on a fir-stump. In some sporangia the capillitium is 

 marked with three or four spiral bands, in others the threads have 

 only two spirals ; the latter number occurs most frequently. 



'II. leiotricha Lister. H. A single group of about five 

 sporangia was found on a fallen twig. The capillitium in this 

 specimen is practically that of a Trichia, consisting of very long 

 sparingly branched coiled and tw T isted threads which are either 

 free or attached at one end to the sporangium-wall ; the four 

 spiral bands with which they are marked are distinct but not 

 prominent. 



Arcyria cincrca (Bull.) Pers. L., H. — A. incarnata Pers. L. 



Pcrichcena chrysosperma (Currey) Lister. H. 



IPerich^na vermicularis Eost. M. Found on old thistle- 

 stalks on the alps. Three sporangia only were found ; their walls 

 are strongly papillose ; the capillitium is sparingly developed. 



Margarita metallica (Berk. & Br.) Lister. M. The sporangia 

 were found on chips in a spruce wood. They form curved plas- 

 modiocarps, and are lilac-grey in colour with iridescent reflections. 



