Galapagos Fungi— MARTIN 
75 
basis of examination with a hand lens it was 
recognized in the field as probably a Sehacina 
and so entered. Early in October it was soaked 
and put in a moist chamber and a scanty but 
adequate spore-print was secured. Rogers 
describes the spores as "evenly oblong to ellip¬ 
soid-oblong, 9-11X6-7. 5/a, or ellipsoid-sub- 
globose, 7-9 X 6-8/a.” This description is in 
close agreement with that of spores found in 
mounts from the dried specimen. The spores 
from the spore-print are almost all globose, 
10-11/a in diameter. 
The only other Basidiomycetes collected are 
a unique, rough-spored Coprinus isolated from 
goat dung and a small Pleurotus which appeared 
on Bursera wood. Both were secured in pure 
culture. The Coprinus fruits readily in culture, 
and has been referred to Dr. A. H. Smith for 
detailed study. The Pleurotus has thus far failed 
to form fructifications. 
FUNGI IMPERFECTI 
* Helicosporium guianensis Linder 
Referred to this species on the basis of the 
yellow color of the conidia in mass; the slender 
conidiophores, 4.5/a in diameter below, with a 
tendency to slightly swollen, rounded tips; the 
branching, bladder-like projections on which the 
spores are borne; and the size of the spores. 
Differing from the species as described (Lind¬ 
er, 1929: 280) in the branching of the conidio¬ 
phores, which is much like that of H. aureum 
(Cda.) Linder, from which species it differs, 
however, in the more slender conidiophores and 
the character of the spore-bearing branches. 
Further study may reveal that such forms merge 
by imperceptible degrees into H. aureum, but 
for the present it seems permissible to maintain 
the distinction. On thorns of Scutia spicata. 
* Memnoniella echinata (Riv.) Galloway 
This widespread species occurred in several 
cultures and was particularly abundant on dead 
Opuntia stems. 
* Tetracrium incarnatum sp. nov. (Fig. 2 f-h) 
Sporodochiis pulvinatis, pallide cinnamomeis 
vel incarnatis, 0.4-0.8 mm. diam.; conidiophoris 
elongatis, tenuatis, basibus 5/a diam., apicibus 2/a 
diam., protrudentibus usque ad 80/x; conidiis 3- 
8-digitatis, ramis radiatio-cylindraceis, plurisep- 
tatis, 45-50/a longis, 3.5-4.5/a latis. 
Sporodochia pulvinate to subglobose, at first 
white, becoming pale cinnamon, pallid ochra- 
ceous or flesh-colored (close to pale ochraceous 
buff of Ridgway), 0.4-0.8 mm. in diameter; 
conidiophores slender, protruding from body of 
sporodochium 60-80/a, 5/a in diameter at base, 
tapering to 2/a at apex just below constriction 
marking junction of spore; conidia digitate, of 
3-8 multiseptate, subparallel, cylindrical arms, 
45-50/a in total length, the arms 3.5-4.5/a in 
diameter. 
GALAPAGOS: South Seymour Island. On dead 
stem of Opuntia sp. collected September 5,1945, 
moistened October 25, 1945, developed January, 
1947, 6333, type. 
After the appearance of the Myxomycetes 
already noted, the material in the moist cham¬ 
bers became covered with various molds which 
soon disappeared and were replaced by a dense 
growth of the Memnoniella, which appeared to 
cover the substratum completely. It was not 
until January, 1947, that the sporodochia of the 
Tetracrium were noted, although they may have 
appeared earlier. They tended to form at the 
tips of spines or other projections. The con¬ 
spicuously protruding conidiophores made the 
sporodochia appear, under the binocular, as 
though covered with glandular hairs. Further 
examination showed that the Memnoniella had 
been almost completely replaced by a Curvularia. 
The genus Tetracrium was established by 
Hennings (1902: 116) for a fungus from Bra¬ 
zil occurring on orange leaves covered with in¬ 
sect larvae. Hennings believed the fungus at¬ 
tacked the larvae first and then spread to the 
leaves and twigs. Although a few mites were 
present in the chambers, there was no evidence 
of any connection between them and the fungus 
here described. Hennings assigned his genus to 
the Mucedinaceae. Hohnel (1911:405) re¬ 
examined Hennings’ material and found that it 
