SIPIIOPTYCIIIUM.] 
TUliULINACEiH. 
155 
The type specimen of rnhnlhm fjiuu-unilica Mass. (Mon., p. 39),fi-oni 
Guarapi, Argentine Republic, docs not belong to the Mycetozoa ; it 
consists of sfalked heads composed of a densely interwoven tissue of 
brown septate branching hypha>, bearing numerous umber spores, 
2 to 7 M diam., in the upper part ; it belongs to the JJy2Jhomycetes. 
Licca spumarioidea Cooke & Mass., in Grev., xvi., p 74:,=Tuhulma 
spumarioidea Mass., Mon., p. 42 (K. 801), is also a Hyphomycetous 
fungus, Sepedoniwn clirysosperiiium Link. 
Genus 28.— SIPHOPTYCHIUM Eostafinsld, Mon., App., p. 32 
(1876). Sporangia cylindrical, closely compacted on a common 
hypothallus, provided with a central tubular columella connected 
with the sporangium-wall by straight radiating hollow processes. 
1. S. Casparyi Rost., I.e. (1876). Plasmodium white, on rotten 
wood (teste Rex). Sporangia in shape, size, and colour as in 
T^ibidinafragiformis, 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 /x, 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, x 80 ; h. 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, " ^thalia are found in 
■which from one-third to one-half of the component sporangia lack 
both columellas and connecting threads " (^.c, 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 Tubidina fragiformis that 
it is a question whether the presence of the pseudo-columella is a 
character of suflficient importance to justify a generic distinction. 
Hab. On dead wood.— Adirondack Mts., N.Y. (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 tubular 
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 
