92 
P. vincta is sometimes confused with P. collabens Fr., a common species 
in the Temperate Zone and also found in southern Florida and Central 
America. The two species are similar in structure and appearance, hut 
the latter is of a permanently deeper red. has larger and more conspicuous 
incrusted cystidia, spores typically allantoic!, margin soft and spongy 
when present, and the pink soft spongy mycelial sheets in the substratum 
never coalesce to form rhizomorphs. It is moreover confined to coniferous 
wood. P. collabens Fr. is also known under the following names: P. 
aurantiaea (Rostk.) Saec., P. emollita Fr. (in part), P. blytii Fr., P. vincta 
(Berk, ex (Vntr. Prov. Amor. No. 208, not type det. Berkeley). P. mcarnata 
Fr. (Icon Selec. tab. 189 f. 1., not Syst. Myc, not Pers.). P. rixosa Karst, 
P. aurantiaea liostk. var. saVoisensis Karst. and P. dodgei Murr. Another 
species with which P. vincta could be confused is P. nitida Pers. This 
species occurs in subtropical regions on frondose wood. It has larger 
pores than P. vincta and has ellipsoid spores, but, as in the other two 
species, incrusted cytidia are present in the hymenium. The synonymy 
of P. nitida is as follows: P. eupora Karst. P. niicuns Rostk., P. attcnuata 
Pk.. P. blyttii Fr. var. lutescens Fr. (in herb.). 
Protostegia h< vcac Charles, n. sp. Pycnidia subknmersed, cupuliform, orbicu- 
lar, fuscous black, membranaceous, scattered, margin 8 to 11 lacinate-stellate, 
75 to 100 fi in diameter: spores 5 to 7 fasciculate-pedicellate, pedicel 8 /i 
in length, hyaline, aeieuiate-falcate, 5 to 7 septate, 2 to 3 by 15 to 36 /x, 
mostly 30 to 36 m in length. On dead twigs of Hcvca brasiliensis Weir, 
Para. Brazil. Type in Pathological Collections (No. 72524), United States 
Department of Agriculture. Cooke in his generic diagnosis of Protostegia 
(Grev. vol. 9, p. 19) describes the spores as simple or septate. The type 
species P. eucleae is given as 3 to 5 septate. Saceardo (Sylloge ill, 
I>. 690) describes the spores as continuous and places the type species /'. 
eucleae in the cenus Pilidium, which genus, however, was described by 
Kunze (Mykologische Heft; Gustav Kunze, Heft. 2. p. 02. Leipzig. 1823) 
as having fusiform spores, the type species, Pilidium accviniun. conforming 
to this description. In view of the Original description of the type species 
of the genus Protostegia this species is placed in this genus. 
Rhizopus nigricans Ehr. Mycelium dark brown at maturity; rhizoids numer- 
ous, branched, black-brown when mature: sporangiophores in tufts, erect, 
simple, dark brown : sporangia globose, white when young, black-brown 
when mature, 100 to 350 fi broad: columella large, hemispherical; spores 
pale to brown, irregular, (i to 17 n long. On inflorescence in damp situa- 
tions. Amazon region. 
Rigidoporus microporus (SW.) Van Overeem, recently used for Polyporus 
lignosus. 
RoselUnda bunodes (B. and Br.) Sacc. Perithecia superficial, embedded at 
first in a purple-brown velvety mycelium, gregarious, brown to black when 
old. spherical, roughened with wartlike scales arranged concentrically. 1 
to 1.8 millimeters in diameter; ostiola sometimes not conspicuous: asci 
fusiform, stalks rather long. 200 to 300 M long by 12 to 16 w broad. 8- 
spored : spores fusiform, somewhat irregular in outline, with threadlike 
appendages at both ends, black-brown, 80 to 110 /x long (without appen- 
dages) by 7 to 12 /x broad: conidia hyaline. On roots of Hevea and as- 
sociated trees. Amazon region, Dutch East Indies. 
7?. hystricula B and Br.=Fracchia?a. 
R. puiggarii Pat. Perithecia connivent in groups, 3 centimeters or less in di- 
ameter, seated upon rough pseudostromatic subicula; perithecia rarely- 
exceeding 2 millimeters in diameter, usually borne upon a stipe 1 milli- 
meter or less in length : ostiole prominent, surrounded by a smooth cir- 
cular area about 1 millimeter in diameter, rest of perithecial surface 
slightly granular, roughened: perithecial cavity spherical, reaching 1.5 
millimeters in diameter: asci clavate. cylindrical, short or long stipitate; 
spores navicular, acute to subumbonate, light to dark brown to opaque, 
33 to 45 by 8 to 15 ix. On dead wood, Rio Madeira, Brazil. 
R. subiculata (Schw.) Sacc. Perithecia scattered to gregarious, rarely 
crowded, subglobose, 1 to 1.5 millimeters in diameter, seated on the in- 
crusted remnant of subiculum, dull dark brown, ostiole papilliform ; asci 
not seen: spores subinequilateral, 12 to 14 by 5 to G /x. On dead roots, 
Amazon region. 
R. sp. Black-root disease, Granada (Ballou), Gold Coast (Bunting), Dominica 
(Jones). 
