154 
ENDOSPOUE^. 
[tubulin A. 
passing across the sporangium or taking an oblique course ; this 
appearance indicates a tendency in the direction of the marked 
development of tubular processes in Slphoptychium. The substance 
of the sporangium-wall varies in different gatherings ; it may be 
delicately membranous, or firm and of considerable thickness. There 
is also some variation in the shape of the upper portion of the 
sporangium ; in some American specimens of the more fragile type 
the apex is produced into a sharp cone ; in others the sporangia are 
cylindrical, obtuse, and but slightly connected with each other, those 
on the outside of the cluster being often entirely free ; in the stouter 
type the walls are closely compacted, their apices forming a level 
tesselated surface. 
A full account of the forms of Tuhulina and their relation to 
Siphoptychium is given by Dr. Rex, I.e. T. speciosa Speg. (Nov. Add. 
ad Myc. Ven., No. 123), from N. Italy, appears from the description 
to be T.fragiforinis, but no mention is made of the size of the spores. 
Hab. On dead wood. — Bowood, Wilts (B. M. 302) ; Penzance, 
Cornwall (B. M. 303) : Luton, Beds (L:B.M.124) ; Clifton, Notting- 
hamshire (B. M. 1103) ; Wales (B. M. 9, 10); France (Paris Herb.); 
Germany (B. M. 656) ; Poland (Strassb. Herb.) ; Finland (B. M. 655): 
India (K. 1650) ; Java (B. M. 1104) ; Japan (K. 1649) ; Java (B. M. 
1104) ; Australia (K. 1653) ; Philadelphia (L:B.M.124); Iowa (B. M. 
823) ; S. Carolina (K. 806). 
2. T. stipitata Rest., Men., p. 223 (1875). Plasmodium white 
or colourless (teste Rex). Sporangia in shape, size, and colour 
as in T. fraytformis, usually clustered on a dark brown spongy 
hypothallus, which has the form of a stout common stalk 2 to 
3 mm. high. Spores pale rufous-brown, minutely reticulated 
over the greater part of the surface, the remaining part smooth 
or marked with ridges, 3 to 5 /x diam. — Cooke, Myx. Brit., fig. 2 ; 
Rex, in Bot. Gaz., xv., p. 318 ; Mass., Mon., p. 38. Licea stipitata 
Berk, & Rav., in Journ. Linn. Soc, x., p. 350 (1868). 
Plate LVIII., A. — d. cluster of sporangia on a stalk-like base, x 3 ; e. 
spores ; one shows the side on which the reticulation is imperfect, x 600 
(United States). 
Dr. Rex considers T. stipitata a distinct species from T. fragiformis, 
Bpecially marked by the smaller spores. The stalk is a less important 
character, for he states that sessile clusters are not uncommon. The 
conical form supphed by him and referred to under T. fragiformis has 
spores measuring 4 to 6 /x, and may represent an intermediate form. 
Hah. On dead wood.— Bonin Islands (K. 821); Philadelphia (L:B.M. 
125) ; S. Carolina (B. M. 538, 929, 946) ; Cuba (B. M. 539). 
SPECIES EXCLUDED FROM THE GENUS. 
T. ccespitosa Mass. = Lindhladia Tuhulina Fr, 
T. effusa Mass. = Lindhladia Tuhulina Fr. 
T.JlexuosaM.a.ss. = Licea Jlexuosa Tern. 
T. minima Mass. = Licea minima Fr. 
T. sj)ermoides Mass. = Lindhladia Tuhulina Fr. 
