TUBULINACEiE. 
153 
TUBULINA.] 
Sporangium -wall with tubular extensions springing from the 
apex, without a pseudo-columella ; sporangia stalked. 
(29) Alwisia. 
Fig. 37. — Alwisia Bombarda Berk. & Br. 
a. Three chisters of sporangia. Twice natural 
size. 
b. Immature sporangium, showing capillitium 
tln-ough the transparent walls. (Drawn 
from a glycerine mounting.) Magnified 12 
times. 
e. Upper portion of three capillitium threads, 
showing attachment to the sporangium-wall. 
Magnified 70 times. 
Fig. 37. 
Genus 27.— TUBULINA Persoon, in Rom. N. Mag. Bot., i. p. 91 
(1794). Sporangia cylindrical, crowded on a common hypothallus ; 
capillitium none. 
KEY TO THE SPECIES OF TUBULINA. 
Sporangia clustered on a broad hypothallus, spoi'es 5 to 8 /t. 
1. T . fragiformis 
Sporangia clustered on a stalk-like hypothallus, spores 3 to 5 /x. 
2. T. stipitata 
1. T. fragiformis Pers., Ic. (1794). Plasmodium watery-white, 
in rotten wood. Sporangia cylindrical, angled, convex above, 
3 mm. long, 04 mm. broad, densely crowded on a common spongy 
hypothallus forming a honeycomb-like rufous-brown mass, 2 to 7 
cm. in breadth ; sporangium-wall membranous, pale rufous- 
brown. Spores pale rufous-brown, minutely reticulated over the 
greater part of the surface, the remaining part smooth, or 
marked with broken ridges, 5 to 8 diam. — Lam. & DC, Syn. 
PI., p. 52 (1806). jSphcerocarjms cylindricus Bull., Champ., 
PI. 470, fig. 3. Tuhulina cylindrica Lam. & DC, Syn. PL, 
p. 52 (1806); Rost., Mon., p. 220; Cooke, Myx. Brit., p. 54; 
Blytt, Bidr. K. ISTorg., Sop. iii., p. 9; Rex, in Bot. Gaz., xv., 
p. 315; Macbride, in Bull. Nat. Hist. Iowa, ii., p. 114; Mass., 
Mon., p. 39. T. nitidissima Berk., Journ. Linn. Soc, xviii., 
p 387. Licea ruhiformis Berk. & Curt., Fung. N. Pac, in 
Proc. Amer. Acad. Art and Sci. (1859), p. 125. 
Plate LVIIL, k.—a. tubular sporangia clustered on a spongy barren 
base, X 3 ; J. spores ; in two the side is shown on which the reticulation 
is imperfect, x 600 (England) ; c. part of a cluster of sporangia with 
conical summits, x 3 (United States). 
On examination of the sporangium-wall with a high magnifying 
power, it is seen to be more or less beset with minute papillse ; small 
pouches may also be occasionally observed extending inwards to a 
greater or less degree, which in some forms are produced into tubes 
