TUBULINA.] 



TUBULINACE^:. 



153 



Sporangium -wall with tubular extensions springing from the 

 apex, without a pseudo-colurnella ; sporangia stalked. 



(29) ALWISIA. 

 Fig. 37. Alwisia Bombarda Berk. & Br. 



a. Three clusters of sporangia. Twice natural 



size. 



b. Immature sporangium, showing capillitium 



through the transparent walls. (Drawn 

 from a glycerine mounting.) Magnified 12 

 times. 



c. Upper portion of three capillitium threads, 



showing attachment to the sporangium-wall. 

 Magnified 70 times. 



Fig. ST. 



Genus 27. TUBULINA Persoon, in Rom. N. Mag. Bofc., 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, spores 5 to 8 /*,. 



1. T.fragiformis 



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



2. T. stipitata 



1. T. fragiformis Pers., I.e. (1794). Plasrnodium watery-white, 

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

 3 mm. long, O4 mm. broad, densely crowded on a common spongy 

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

 cm. in breadth ; s^ ^angium-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 /x, cliam. Lam. & DC., Syn. 

 PL, p. 52 (1806). Sphcerocarpus cylindricus Bull., CLarnp., 

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

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

 Blytt, Bidr. K. Norg., 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 rubiformis Berk. & Curt., Fung. 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 ; b. 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 papillae ; small 

 pouches may also be occasionally observed extending inwards to a 

 greater or less degree, which in some forms are produced into tubes 



