Saprolegnia - The iLumina Digital Library

cells simple; long, cylindrical or tubular, rarely long-clavate; branched or unbranched;
laterally appressed, rarely attached in a digitate fashion; persisting; fertilization tubes
not observed.
Aside from the members of Saprolegnia with ornamented oogonia, S. turfosa is
one of the species of the genus that is most easy to recognize. The large, very shortstalked
oogonia attended by androgynous antheridial branches each terminated by a
long, tubular antheridial cell (Fig. 95 A) mark this species. Saprolegnia uliginosa also has
short-stalked oogonia (Fig. 95 F) but its antheridial branches are frequently
monoclinous (these are infrequent in S. turfosa).
In view of the ease with which Saprolegnia turfosa can be recognized, its
taxonomic history is surprisingly complicated. Seymour (1970:28, 29) reviewed the
systematics of this species particularly thoroughly, and only a few additional comments
are necessary. Reinsch (loc. cit.) was apparently the first to see S. turfosa, but chose not
to name it. He (loc. cit., p. 311) referred to figure 15 on plate 17 as an illustration of
Saprolegnia sp. 2, but this was an error; that figure depicts sporangia of a Gonapodya.
Coker (1923) apparently had difficulty in recognizing S. turfosa, a situation which he
corrected in his 1927 paper. It appears that A. Lund (1934) misidentified S. turfosa,
equating it with Aplanes treleaseanus (see Achlya androgyna). He listed both S. treleaseana
of Humphrey (1893) and Achlya treleaseana (Humphrey) Kauffman as synonyms of what
is here recognized as S. turfosa. In addition, A. Lund (1934:21) also considered that
Petersen’s S. paradoxa was synonymous with Aplanes treleaseanus; Petersen’s species, on
the contrary, is conspecific with S. turfosa. It is very likely that the Aplanes turfosus
reported from the Soviet Union by Morochkovs’kiĭ et al. (1967) was Achlya androgyna. In
their account of the Russian material, papillate oogonia are described for the specimen
they encountered.
Saprolegnia turfosa is evidently not common (although it is widely distributed). In
our experience, individuals appear most frequently in water or debris from Sphagnum
spp. bogs. We have recovered S. turfosa repeatedly from acid waters (not bogs) in
Norway and Sweden. A specimen collected on hempseed baited in a bog water sample
from Norway was infected with Olpidiopsis saprolegniae var. saprolegniae.
CONFIRMED RECORDS: -- CZECHOSLOVAKIA: Cejp (1959a:271, figs. 104,
105). DENMARK: A. Lund (1934:20, fig. 7); Petersen (loc. cit.). GERMANY: Minden (loc.
cit.); Reinsch (loc. cit.); Richter (1937:259, fig. 17). ICELAND: Howard et al. (1970: fig. 36).
JAPAN: Kobayasi and Ookubo (loc. cit.). LAPLAND: Gäumann (loc. cit.). LATVIA:
Apinis (1929a:227). UNITED STATES: Beneke (1948b:38, pl. 3); R. L. Butler (1975: figs.
29-32); Coker (1923:79, pl. 20; loc. cit.); Kobayasi et al. (1967:10, pl. 14, fig. M; text fig. 3);
Milanez (1966:110, pl. 12, fig. d; pl. 13); Milanez and Beneke (1968:19, pl. 2, fig. 10);
Overman (1970:36); Seymour (1970:27, figs. 40-48); A. W. Ziegler (1948b:16, pl. 1, figs.1-
9; 1952:13, pl. 5, fig. 4). USSR: Logvinenko and Meshcheryakova (1971: fig. 7).
RECORDED COLLECTIONS: -- BRITISH ISLES: Dick (1962, 1963, 1966); Dick
and Newby (1961). CANADA: Dick (1971c). CZECHOSLOVAKIA: Cejp (1931).
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