358 MONOGRAPH OF THE LABOULBENIACE^. 
second pair of pcrithecia arise in all probability from secondarj^ divisions of the pair of peritliecia- 
Icarin'^- cells above described ; but the exact structure in this region, behind tlie stalk-cells of the 
pcrithecia, has not been made out satisfactorily. An obliquity in the septum which separates 
the basal and sub-basal cells sometimes results in the apparent absence of any sub-basal cell. 
DiPLOMYCES AcTOBiANUS Thaxter. Plate X, figs. 18-21. 
Froc Am. Acad. Arts and Sci, Vol. XXX, p. 4G9. 
More or less faintly tinged with Lrownlsli, Basal cell of receptacle triangular, sub-basal 
cell flattened or wedge-shaped; the posterior prominences peculiar to the genus nearly as long 
as the receptacle itself, slightly divergent, two-celled, tlic terminal cell twice as long as the 
basal, tapering slightly towards its rounded extremity. On the anterior side the two pcrithc- 
cigcroQs cells bear the first pair of pcrithecia on short stalk-cells bent abnipllj* upward, diver- 
gent, and succeeded by three small cells forming the base of tlie perithecium. The pcritliccia 
rather slender, curved towards the receptacle, so that their tips project beyond it, divergent, 
rather long and slender, tapering slightly, the apex blunt with ill defined lips, the base of the 
old trichogyne persisting conspicuously below the pore. Appendages bi'anchinir, arranged in 
pairs symmetrically like the pcrithecia ; a smaller one arising just behind the stalk-cell of the 
perithecium, a much larger one above this followed by a few smaller ones less definitely arranged 
in the region whence a second pair of pcrithecia may arise. All the appendages more or less 
copiously branched, the branchlets terminating in many cases by the slender, curved, and sharply 
pointed cells characteristic of Tcratomyccs. Spores, 32 X 2 ^. Pcrithecia, including stalks, 
about 75 X 12^. Receptacle to tips of prominences, 75 /i. Total length to tip of pcrithecia, 
110 ft. Greatest width, 37 fi. 
On Actoblus nanus Horn, Massachusetts. 
This species occurs rather rarely on the abdomen of a large brown variety of Adollus 
nanus, but not as far as has been observed on the normal form. A second species, perhaps dis- 
tmct from the present, was found on the abdomen of a small I'hilonthus, and is distinguished 
by the presence of slender thread-like branches from the larger appcndagos. PufT.cient material 
ot this form was not, liowever, obtained, and it may prove to be nothing more than a variety of 
the one above described. 
RIIACHOMYCES Thaxter. Pktes II, IV X-XII. 
P«.c. An,. AcaJ. A,u and Sci. Vol. XXX, p. 408 ; Ac,n,h,n,ce, Th.-,K,c, (ucc Ubcn). 1. c. Vol. XXVII, p. 36, 
Receptacle consisting of a single basal cell surmounted by a more or less elongated body 
composcd on one side of a primary scries of superposed nearly equal cell. ; on the opposite side 
Id" TV """'" '"'' "'*" '"™"°"^ colls bearing large numbers of bris.le-likc 
tTecia nfn? "*"'"= "? '" ™^ ™"<= <"' '»^« s«n-ou,„ling the base of the perithecium. IVri- 
1 ec a pioduced laterally near the tip of the receptacle, at maturity apparently terminal, stalked 
stacks "''"^' '^•"'"''™'''- Spores onee-septatc. Antheridial cell single; tern.inal on short 
