186 
an umbel of four short branchlets, each of which is terminated by 
a subglobose smooth sporangium. The tip of the branchlet ex- 
pands gradually into the subglobose columella, to the base of 
which part of the sporangium wall remains attached after the 
dispersal of the spores. ‘Lhe whole plant is entirely colourless ; 
the spores are small, oblong, and blunt at the ends. — From the 
mode of branching I have named it RAzzopus umbellatus (plate 
IX. fig. 5). In one instance I found the main sporangiophore 
terminate in a sporangium with one side branchlet imperfectly 
developed ; all the other examples have the umbellate head of 
branches. I have only found it once on clover seed, associated 
with another J/ucor. It is entirely microscopic, and I have not 
succeeded in cultivating it. The Mwxcor in which it was en- 
tangled, if indeed it was not parasitic on it, I have determined to 
be Mucor erectus Bain. (plate IX. fig. 6). It forms delicate silky 
white tufts 2 or 3 centimetres in length. The hyphe branch 
frequently, and the very unequal branches terminate in a small 
yellowish sporangium. A distinctive feature of this species is 
the septum that is always present just above the point where 
the branch is given off. I found it on turnip and carrot seeds, 
and I got a further abundant growth on a mixture of gelatine and 
bean decoction. JMJucor erectus has been found in Ltrope on 
bread, plum decoction, and potatoes, but this is the first record for 
Britain. I have not yet been able to induce the growth of 
zygospores. J. racemosus Fres. (plate IX. fig. 7) appeared on 
clover seeds. It is easily recognisable from the chlamydospores 
which are produced in great abundance on the hyphe and 
sporangiophores. I hardly think it is new to this country, 
but I cannot find any published record of its occurrence. _ It 
grows on a great variety of substances, and is very common on 
the Continent. 
EXPLANATION OF PLATE IX.* 
Fig. 1.—Sepfedonium xylogenum Sacc. a, branches with developing spores 
from a culture x soo. 6, mature spores x 500. 
35 2.—Fusarium conmutatum Sacc. a, sporophores with developing spores 
x go. 6, mature spores x 500. 
3) 3-—Langloisula macrospora sp. n. Fertile branches and spores x 500. 
5» 4—Stemphyliopsis heterospora g. et sp. n. Fertile hyphew and spores 
x 500. 
” ad eee umbellatus Sp. N. a, sporangiophore with columellae x 90. 
6, sporangium x 250. ¢, rootlets x 250. d, spores x 500. 
53 6.—Mucor erectus Bain. a, sporangiophore x 250. 6, columella x 5, 
spores x 500. 
99 7-—Mucor racemosus Fres. a, hyphe with chlamydospores x 250. , 
sporangium with spores x 250. ¢, empty sporangium x 250. 4% 
spores x 500. 
5,5 8.—Mucor spinosus Van Tiegh. a, branching sporangiophore x 909. b, 
columella and spores x 500. 
3 9-—Sphaeronemella oxyspora Sacc. a, pycnidia x 35. 4, sporophores and 
spores x 500. 
*(By kind permission of the Royal Microscopical Society). 
