Saprolegnia - The iLumina Digital Library
Saprolegnia - The iLumina Digital Library
Saprolegnia - The iLumina Digital Library
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<strong>Saprolegnia</strong> irregularis is recognized by its prominently irregular oogonia and<br />
often profusely developed fertilization tubes (Fig. 94 H, K, M). No other known species<br />
in the genus has this combination of characters.<br />
<strong>The</strong> hypogynous antheridial cells (not all oogonia are attended by these) of<br />
<strong>Saprolegnia</strong> irregularis are of two types. Generally, the apex of the cell is prolonged into a<br />
fertilization tube (Fig. 94 M), but occasionally the apex is open (into the oogonial<br />
cavity), and secondary antheridial cells proliferate internally (Fig. 94 J, L, N). Precisely<br />
how the antheridial apparatus functions in this species is not known, and it is<br />
conceivable that the distally poroid cells (Fig. 94 H) simply may represent ones from<br />
which the fertilization tube has deliquesced. In any event, the internally proliferated<br />
cells recall Maurizio’s (1894) belief that the hypogynous cells and fertilization tubes in S.<br />
hypogyna were merely expressions of renewed growth.<br />
CONFIRMED RECORD: -- ICELAND: Johnson and Seymour (loc. cit.). INDIA: J.<br />
N. Rai and Misra (1977b:76, fig. 3b).<br />
SPECIMENS EXAMINED: - ICELAND (7), TWJ.<br />
<strong>Saprolegnia</strong> turfosa (Minden) Gäumann<br />
Bot. Not. 1918:154. 1918<br />
(Figure 95 A-C)<br />
<strong>Saprolegnia</strong> spec. (2) Reinsch, Jahrb. Wiss. Bot. 11:295, pl. 14, figs. 7-13. 1878.<br />
<strong>Saprolegnia</strong> paradoxa Petersen Bot. Tiddskr. 29:379, fig. l d, e. 1909 (also in Ann. Mycol.<br />
8:520, fig. l d, e. 1910); non S. paradoxa Maurizio, Z. Fischerei und deren<br />
Hilfswiss., Mitt. Deutsch. Fischerei-Vereins 7:46, figs. 10-12. 1899.<br />
<strong>Saprolegnia</strong> monoica var. turfosa Minden, Kryptogamenfl. Mark Brandenburg 5:516. 1912.<br />
Aplanes turfosus (Minden) Coker, J. Elisha Mitchell Sci. Soc. 42:216. 1927.<br />
Aplanes ozeensis Kobayasi, in Kobayasi and Ookubo, J. Jap. Bot. 27:181, figs. 9, 10. 1952.<br />
Monoecious. Mycelium stout; hyphae sparingly branched. Sporangia fusiform,<br />
clavate, or cylindrical; straight, curved, or moderately irregular; renewed internally;<br />
102-627 x 18-66 µm. Spores dimorphic; discharge and behavior saprolegnoid,<br />
infrequently aplanoid; primary spore cysts 9-11 µm in diameter. Gemmae sparse or<br />
absent; when present, cylindrical, obpyriform, irregular, or branched; terminal, rarely<br />
intercalary; predominantly single. Oogonia lateral, rarely terminal, intercalary, or<br />
sessile; spherical, rarely ovoid or subspherical; (18-) 60-85 (-134) µm in diameter,<br />
including wall ornamentations. Oogonial wall conspicuously pitted; smooth or rarely<br />
with a few short, broad papillae. Oogonial stalks very short, predominantly ( 1 / 8 -) 1 / 4 -<br />
1 / 2 (-2) times the diameter of the oogonium, in length; stout, straight or curved;<br />
unbranched. Oospores centric; spherical or ellipsoidal; (1-) 6-16 (-42) per oogonium, and<br />
usually filling it; (16-) 26-31 (-37) µm in diameter; germination not observed.<br />
Antheridial branches androgynous, infrequently monoclinous and arising near the<br />
oogonial stalk; short, curved or bent, unbranched or branched; persisting. Antheridial<br />
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