tubifeka] tubulin aceae 191 



Sporangia clustered, stalked, ellipsoid ; capillitium a brush 

 of tubular threads attached above and below to the sporan- 

 gium-wall. (32) Alwisia. 



Fig. 40. — Alwisia Bombarda Berk. & Br. 



a. Three clusters of sporangia. Twice natural size. 



b. Immature sporangium ; the capillitium is seen 



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. 40. 



Genus 31.— TUBIFERA Gmelin Syst. Nat., ii. 1472 

 (1791). Sporangia cylindrical, crowded on a common hypo- 

 thaUus. 



KEY TO THE SPECIES OF TUBIFERA. 



A. Sporangia without pseudo-columella : — 



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



1. T . ferruginosa 



Sporangia clustered on a stalk-like hypothallus, spores 



3 to 5 /x. 2. T. stipitata 



B. Sporangium-wall with tubular extensions connecting it 

 with a hollow pseudo-columella. 3. T. Casparyi 



1. T. ferruginosa Gmel. I.e. Plasmodium watery- white, 

 rarely bright yellow, changing to either rose-red or mulberry- 

 red in the young sporangia. Sporangia densely crowded, 

 cylindrical, angled by mutual pressure, convex or conical 

 above, 3 mm. long, 0*4 mm. broad, light reddish-brown or 

 umber, seated on a common spongy hypothallus and forming 

 a honeycomb-like rufous-brown mass, 2 to 7 cm. in 

 breadth ; sporangiuni-wall membranous, pale rufous- 

 brown. Spores pale rufous-brown, closely and minutely 

 reticulated over the greater part of the surface, the 

 remaining part nearly smooth, or marked with broken 

 ridges, 5 to 8 ^ diam. — Macbr. N. Am. Slime-Moulds, 156. 

 Stemonitis ferruginosa Batsch Elench. Fung., 261, fig. 175 

 (1786). Tubulifera ceratum Mull. Fl. Dan., t. 659, fig. 2 (1777) ? 

 {nomen). T. arachnoidea Jacq. Misc., i. 144, t. 15 (1778) ? 

 T. coccinea Trentep. in Roth Catal. Bot., i. 243 (1797). 

 Sphaerocarpus cylindricus Bull. Champ., 140, t. 470, fig. 3 

 (1791). S. fragiformis Bull. I.e., 141, t. 384. Tubulina 

 fragiformis Pers. in Roemer N. Mag. Bot., i. 91 (1794) ; 

 Lister Mycetozoa, 153. T. fallax Pers. Obs. Myc, ii. 28 

 (1799). T. cylindrica DC. Fl. Fr., ii. 249 (1805) ; Rost. 

 Mon., p. 220 ; Rex in Bot. Gaz., xv. 315 ; Mass. Mon., 39. 

 T. conglobata Preuss in Linnaea, xxiv. 140 (1851). T. 



