Key 6:
SECTION 6:
Sporangium predominantly citriform (lemon-shaped) or saddle-shaped, ovoid, or oblong; the long axis of the sporangium parallel with the surface of the substratum.
- Sporangium citriform.............................................................................2
Sporangium saddle-shaped, ovoid, or broadly pyriform...............................3
- Resting spore spherical, outer wall smooth............................R. transversum
Resting spore polyhedral....................................................R. goniosporum
- Sporangium saddle-shaped....................................................R. ephippium
Sporangium ovoid or broadly pyriform......................................................4
- Sporangium broadly pyriform, with a single discharge papilla......R. manoense
Sporangium ovoid.................................................................................5
- Sporangium ovoid with two discharge papillae..........................................6
Sporangium ovoid with single discharge papillae.......................................7
- Resting spore wall thick, with columnar bands of refractive material.............
....................................................................................... R. columnaris
Resting spore wall thick but without columnar bands..................R. oblongum
- Endobiotic part a haustorium..................................................R. irregulare
Endobiotic part branched rhizoids ..........................................................8
- Organism parasitic on cysts of Uroglena...................................R. venustum
Organism parasitic on diatom Stephanodiscus.........................R. horizontale
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