72 
PACIFIC SCIENCE, Vol. II, April, 1948 
varieties represented in the material he studied, 
one of which is duplicated in an earlier report, 
making a total of 62 species or varieties from 
the archipelago. None of the species reported 
by Bonar was recognized in the collections here 
noted. 
All Myxomycetes and a majority of the other 
fungi were developed in moist chambers in Iowa 
City. The collections were removed from their 
sterile containers or wrappings, put into sterile 
Petri dishes with flamed forceps, wet with ster¬ 
ile carbon water, and incubated at room temper¬ 
ature. In several dishes Myxomycetes fruited in 
3 to 5 days after wetting. Molds usually ap¬ 
peared a little later. On the other hand, several 
species of Myxomycetes were slow in appearing 
but, once started, continued to develop over a 
considerable period. 
In the listing which follows, species marked 
with an asterisk are those which developed in 
moist chambers. The numbers given are my own 
collection numbers. All specimens are deposited 
in the herbarium of the State University of 
Iowa. Where material permits, portions will be 
distributed to other institutions. A number of 
species not listed here are in the hands of vari¬ 
ous specialists for study. 
Acknowledgments: I am indebted to Dr. H. 
K. Svenson for determination of host species, to 
Dr. G. R. Bisby for determining the Hysterogra- 
phium and for comments on other specimens 
examined by him, to Dr. L. E. Wehmeyer for 
describing and illustrating the new Phaeopelto- 
sphaeria, and to Dr. D. P. Rogers for determin¬ 
ing the Sebacina. 
MYXOMYCETES 
*Arcyria cinerea (Bull.) Pers. 
On dead wood of Bursera, 6314, 6322 2 ; on 
thorns of Scutia spicata, 6318. This is the small, 
slender, long-stalked phase of this common spe¬ 
cies which is often encountered in the tropics. 
2 Two numbers listed as occurring on the same sub¬ 
stratum indicate two different collections. 
*Badhamia affinis Rost. 
On wood of Bursera, 6329. The early fruit- 
ings, which began to appear the third day after 
wetting, were typical. Later fruitings tended to 
be smaller, with smaller spores, relatively longer 
stalks, and a somewhat physaroid capillitium, 
but the manner of appearance was such as to 
suggest that all arose from the same plasmo- 
dium, although the plasmodium itself was not 
observed. 
*Badhamia gracilis Macbr. 
On dead stems of Opuntia, 6326. Cacti and 
yuccas are favorite substrata for this species. 
*Clastoderma Debaryanum Blytt 
On wood of Bursera, 6311. 
*Comatricha elegans (Racib.) Lister 
On wood of Bursera, 6313, 6324. 
*Cribraria languescens Rex 
On wood of Bursera, 6310. Originally wet on 
October 17, 1945, the wood on which this grew 
produced this species later in the same month. 
Still later, it bore six additional species of Myxo¬ 
mycetes (6311 to 6316) but no more C. lan¬ 
guescens until it was allowed to become com¬ 
pletely dry in January, 1947. It was again wet 
with sterile carbon water about March 1, and 
by March 6 a typical fruiting had matured. 
*Cribraria violacea Rex 
On wood of Bursera, 6312. 
*Echinostelium minutum deBary 
On wood of Bursera, 6313. 
*Perichaena corticalis (Batsch) Rost. 
On wood of Bursera, 6316, 6323. This spe¬ 
cies appeared shortly after the wood was wet 
and continued to develop singly or in small 
clusters for a period of about 3 months. The 
majority of the sporangia are characterized by 
a prominent circumscissile ridge marking the 
line of dehiscence, and this often joins with a 
coarse and prominent reticulation on the upper 
surface. The spores were at first bright ochra- 
