Saprolegnia - The iLumina Digital Library

internally; 40-220 x 18-28 µm. Spores dimorphic; discharge and behavior saprolegnoid,
rarely aplanoid; primary spore cysts 10-14 µm in diameter. Gemmae very sparse;
clavate or obpyriform; terminal, single. Oogonia spherical, obpyriform, napiform, or
subspherical, rarely dolioform; lateral, occasionally terminal, rarely intercalary; (32-) 46-
60 (-107) µm in diameter. Oogonial wall pitted or unpitted; smooth. Oogonial stalks
( 1 / 4 -) 1-2 (-3 1 / 2 ) times the diameter of the oogonium, in length; stout; straight, curved,
or bent; unbranched or with one or more short, lateral branches. Oospores centric;
spherical, often nearly filling the oogonium; (1-) 6-16 (-28) per oogonium; (18-) 23-26 (-
30) µm in diameter; at germination producing a germ hypha which may or may not
bear a terminal sporangium. Antheridial branches androgynous or monoclinous, rarely
diclinous; slender, usually contorted, twisted, or irregular and sparingly branched;
persisting. Antheridial cells simple, generally tubular, occasionally clavate or slightly
irregular; persisting; laterally appressed, very rarely attached apically; fertilization
tubes present, not persisting.
Saprolegnia glomerata is readily recognizable by the short, branched or
unbranched, contorted, lateral (and often clustered) hyphal extensions (Fig. 96 G, I).
Secondary characters of recognition are the contorted, branched antheridial filaments
(Fig. 96 G, H, J) and the short, lateral evaginations on many of the oogonial stalks (Fig.
96 H). In S. litoralis, the hypha immediately below a terminal oogonium, may bear
short, lateral branches (Fig. 96 B) as does S. glomerata, but in the former, the hypha is
usually swollen at its juncture with the oogonial septum (Fig. 96 A, B). In any case, the
oospores in S. litoralis are occasionally subcentric, a condition not known to occur in S.
glomerata.
Although A. Lund recognized as early as 1934 that Tiesenhausen’s (loc. cit.)
variety glomerata deserved specific rank, not all investigators followed (or were aware
of) this disposition. For example, T. Ito (1944) retained the variety of glomerata and
reduced Saprolegnia furcata and S. glomerata (Tiesenhausen) Lund to synonymy with it.
Cejp (1959a) listed both Lund’s species and S. monoica as synonyms of Tiesenhausen’s
variety. In addition, S. glomerata has been misidentified by some mycologists. Apinis
(1929a, b) believed that Maurizio’s (1899) S. furcata was the same as Tiesenhausen’s
variety glomerata. The specimens recorded by T. W. Johnson (1950b:399) as the variety
glomerata were misidentified; he had collected forms of S. ferax. The S. monoica reported
by Humphrey (1893) was not, as Coker (1923) maintained, identifiable as S. monoica var.
glomerata; Humphrey’s material was very likely representative of S. ferax.
CONFIRMED RECORDS: -- BRITISH ISLES: R.A. Couch (1951:161, p1s. 41-45);
Forbes (1935a:226). CZECHOSLOVAKIA: Cejp (1959a:231, fig. 85 a-f). DENMARK:
Lund (loc. cit.). GERMANY: Richter (1937:237). ICELAND: Howard et al. (1970: figs. 27,
28). INDIA: Thakur Ji (1970:182, figs. 15-18). JAPAN: T. Ito (1942:124, fig. l e-g; 1944:52).
LATVIA: Apinis (1929a: 213, text fig. 1). NETHERLANDS: Beverwijk (1948:232, fig. 3).
POLAND: Szwanke (1938:8, pl. 2, figs. 10, 11; pl. 3, figs. 1-5). SWITZERLAND:
Tiesenhausen (loc. cit.). UNITED STATES: Beneke (1948b:36); T. W. Johnson (1956a:186);
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