154 BND0SPOK±i^. [tubulin 



passing across the sporangium or taking an oblique course ; tl 

 appearance indicates a tendency in the direction of the marki 

 development of tubular processes in Siphoptychium. The substan 

 of the sporangium-wall varies in difiEerent gatherings ; it may 1 

 delicately membranous, or firm and of considerable thickness. The 

 is also some variation in the shape of the upper portion of t 

 sporangium ; in some American specimens of the more fragile ty] 

 the apex is produced into a sharp cone ; in others the sporangia a 

 cylindrical, obtuse, and but slightly connected with each other, tho 

 on the outside of the cluster being often entirely free ; in the stout 

 type the walls are closely compacted, their apices forming a lev 

 tesselated surface. 



A full account of the forms of Tubulina and their relation 

 Siphoptychium is given by Dr. Rex, I.e. T. speciosa Speg. (Nov. Ad 

 ad Myc. "Ven., No. 123), from N. Italy, appears from the desoripti( 

 to be T. fragiformis, but no mention is made of the size of the spores 



Hab. On dead wood.— Bowood, Wilts (B. M. 302) ; Penzanc 

 CornwaU (B. M. 303) : Luton, Beds (L:B.M.124) ; Clifton, Nottin 

 hamshire (B. M. 1103) ; Wales (B. M. 9, 10); France (Paris Herb. 

 Germany (B. M. 656) ; Poland (Strassb. Herb.) ; Finland (B. M. 665 

 India (K. 1650) ; Java (B. M. 1104) ; Japan (K. 1649) ; Java (B. 1 

 1104) ; Australia (K. 1653) ; Philadelphia (L:B.M.124); Iowa (B. J 

 823) ; S. Carolina (K. 806). 



2. T. stipitata Eost., Mon., p. 223 (1875). Plasmodium whi 

 or colourless (teste Rex). Sporangia in shape, size, and coloi 

 as in F. fragiformis, usually clustered on a dark brown sponj 

 hypothallus, which has the form of a stout common stalk 2 

 3 mm. high. Spores pale rufous-brown, minutely reticular 

 over the greater part of the surface, the remaining part smool 

 or marked with ridges, 3 to 5 /u, diam. — Coofce, Myx. Brit., fig. ! 

 Rex, in Bot. Gaz., xv., p. 318 ; Mass., Mon., p. 38. Licea stipiia 

 Berk. & Rav., in Journ. Linn. Soc, x., p. 350 (1868). 



Plate LVIII., A. — d. cluster of sporangia on a stalk-like base, x 3 ; 

 spores ; one shows the side on which the reticulation is imperfect, x 6 

 (United States). 



Dr. Rex considers T. stipitata a distinct species from T. fragifornu 

 specially marked by the smaller spores. The stalk is a less importa 

 character, for. he states that sessile clusters are not uncommon. Tl 

 conical form supplied by him and referred to under T. fragiformis h 

 spores measuring 4 to 6 ^, and may represent an intermediate form. 



Hab. On dead wood. — Bonin Islands (K. 821); Philadelphia (L:B.l 

 125) ; S. Carolina (B. M. 538, 929, 946) ; Cuba (B. M. 539). 



SPECIES EXCLUDED FROM THE GENUS. 



T. ccBspitosa Mass. = Lindhladia Tubulina Fr. 

 T. effusa Mass. = Lindhladia Tubulina Fr. 



T.flexuosa M.a&s. = lAcea flexuosa "Pers. 

 T. minima Mass. = Licea minima Fr. 

 T. spermoides Mass. = Lindhladia Tuhvlina Fr. 



