TUBULINA.] TUBULINACE^. 153 



Sporangium -wall with tubular extensions springing from the 

 apex, without a pseudo-columella ; sporangia stalked. 



(29) Alwisia. 

 Fig. 37. — Ahvisia Soviiarda Berk. & Br. 



It. Three clusters of sporangia. Twice natural 



size. 

 b. Immature sporangium, showing oapillitium 



through the transparent walls. (Drawn 



from a glycerine mounting.) Magnified 12 



times. 

 0. Upper portion of three oapillitium threads, 



showing attachment to the sporangium-wall. 



Magnified 70 times. 



Fig. 37. 



Genus 27.— TUBITLINA Persoon, in E-bm. N. Mag. Bot., i. p. 91 

 (1794). Sporangia cylindrical, crowded on a common hypothallus ; 

 capillitium none. 



KEY TO THE SPECIES OF TUBULIN A. 



Sporangia clustered on a broad hypothallus, spores 5 to 8 |U. 



1. T.fragiformis 



Sporangia clustered on a stalk-like hypothallus, spores 3 to 5 /a. 



2. T. stipitata 



1. T. fragiformis Pers., Ic. (1794). Plasmodium watery-white, 

 in rotten wood. Sporangia cylindrical, angled, convex above, 

 3 mm. long, 0-4 mm. broad, densely crowded on a common spongy 

 hypothallus forming a honeycomb-like rufous-brown mass, 2 to 7 

 cm. in breadth ; sporangium-waill 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). Sphcerocarpus' cylindricus Bull., Champ., 

 PI. 470, fig. 3. Tubulina cylindrica Lam. & DC, Syn. PL, 

 p. 52 (1806); Eost., Mon., p. 220; Cooke, Myx. Brit., p. 54; 

 Blytt, Bidr. K. Norg., Sop. iii., p. 9; Eex, in Bot. Gaz., xv., 

 p. 315; Macbride, in Bull. Nat. Hist. Iowa, ii., p. 114; Mass., 

 Mon., p. 39. T. nitidisaima Berk., Journ. Linn. Soc, xviii., 

 p 387. Licea ruhiformis Berk. & Curt., Eung. N. Pac, in 

 Proc. Amer. Acad. Art and Sci. (1859), p. 125. 



Plate LVIII., A. — a. tubular sporangia clustered on a spongy barren 

 base, X 3 ; 5. 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-waU 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 



