SIPHOPTYCHIUM.J TUBULINACBJ3. 155 



The type specimen of Tuhulina guaranitica Mass. (Mou., p. 39), from 

 Guarapi, Argentine Republic, does not belong to the Mycetozoa ; it 

 consists of stalked heads composed of a densely interwoven tissue of 

 brown septate branching hyphse, _ bearing numerous umber spores, 

 2 to 7 ^ diam., in the upper part ; it belongs to the Hyphomycetes. 

 Licea spuniarioidea Cooke & Mass., in Grev., xvi., p. li:,=Tubulina 

 spumarioidea Mass., Mon., p. 42 (K. 801), is also a Hyphomycetous 

 fungus, Sepedonium chrysospermum Link. 



Genus 28.— SIPHOPTYCHITJM Rostafinski, Mon., App., p. 32 

 (1876). Sporangia cylindrical, closely compacted on a common 

 hypothallus, provided with a central tubular cohimella connected 

 with the sporangium -vi?all by straight radiating hollow processes. 



1. S. Casparyi Rest., I.e. (1876). Plasmodium white, on rotten 

 wood (teste Rex). Sporangia in shape, size, and colour as in 

 Tuhulina frdgiformis, differing in being provided with the central 

 columella described in the genus. Spores pale rufous-brown, 

 closely reticulated over the greater part of the surface, loosely 

 reticulated over the remaining part, 6 to 7 /t diam. Rex, in Bot. 

 Gaz., vol. XV., p. 319 ; Mass., Mon., p. 89. 



Plate LVIII., A.-^. portion of two sporangia with their" walls partially 

 broken away, showing the pseudo-columella and capillitium, x 20 ; g. 

 portion of pseudo-columella and capillitium, y. 80 ; %. spores ; two show 

 the side on which the reticulation is lax, x 600 (United States). 



Dr. Rex is of opinion that the columella in Siphoptychium may be 

 viewed as an aborted sporangium, and adds, " JEthalia are found in 

 which from one-third to one-half of the component sporangia lack 

 both columellas and connecting threads " {I.e., p. 319). 



The species has been found by Dr. Rex on the Adirondack Moun- 

 tains, N.Y., in large quantity, but [it is doubtful whether it has been 

 obtained elsewhere. It is so nearly allied to Tuhulina fragiformis that 

 it is a question whether the presence of the pseudo-columella is a 

 character of sufficient importance to justify a generic distinction. 



Hah. On dead wood.— Adirondack Mts., N.T. (L:B.M.26). 



Genus 29. — ALWISIA Berkeley & Broome, in Journ. Linn. 

 Soc, xiv., p. 86 (1873). Sporangia cylindrical, stipitate, the 

 stalks combined in clusters ; capillitium represented by tulDular 

 extensions of the sporangium- wall springing from the apex of the 

 sporangium. 



1. A. Bombarda Berk. & Br., I.e., p. 87 (1873). Plasmodium? 

 Total height 4 mm. Sporangia cylindrical-ellipsoid, stipitate, 

 clustered, 1 to 1'5 mm. high, 0'5 mm. broad, rufous-brown; 

 sporangium-wall membranous, pale red, beset with minute 

 scattered papillae on the inner side, and occasionally produced 

 into small pouches. Stalks cylindrical, 2-5 mm. high, 0'12 mm. 

 thick, closely adhering in clusters of 4 to 12, brownish-purple; 

 when mounted in glycerine orange-red. Capillitium consisting 



