. 2024 May 2;65(3):133–137. doi: 10.47371/mycosci.2024.02.004

Table 2 Comparison of morphological characteristics between Pythium amaminum and the taxonomically related species.

Organs/characteristics	P. amaminum ^a	P. cedri ^b	P. periplocum ^c
Sporangia	Large complexes consisting of branched, lobulate or digitate elements, 25-77 μm (av. 41.6 μm) long and 14-29 μm (av. 19.3 μm) diam	Toruloid	Large complexes consisting of branched, lobulate or digitate elements, 10 to 30 μm long, 8 to 20 μm, mostly 10 to 15 μm
Zoospore	Formed	Not formed	Formed
Hyphal swelling	Present	Present	No description
Oogonia	Ornamented with blunt spines, 17-25 μm (av. 20.9 μm) diam	Ornamented with blunt spines, 17.5-32.5 μm (av. 24.1 μm) diam	Ornamented with blunt spines, 24-27 μm (av. 26 μm) diam
Spines	1.9-4.3 μm long	2.5-4 μm long	2-4 μm long
Antheridia	Rarely observed	Subclavate, monoclinous, 1-3 per oogonium	Clavate, diclinous, 1-4 per oogonium
Oospore	Aplerotic, 9-17 μm (av. 12.6 μm) diam	Plerotic or nearly plerotic, 14.3-26.5 μm (av. 21.3 μm) diam	Aplerotic, 20-24 μm (av. 22 μm) diam
Daily growth rate	22.5 mm/day at 25 °C on PCA	11 mm/day at 25 °C on PCA	35 mm/day at 25 °C on PCA