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.

Section 6


  1. Sporangium citriform.............................................................................2

Sporangium saddle-shaped, ovoid, or broadly pyriform...............................3

  1. Resting spore spherical, outer wall smooth............................R. transversum

Resting spore polyhedral....................................................R. goniosporum

  1. Sporangium saddle-shaped....................................................R. ephippium

Sporangium ovoid or broadly pyriform......................................................4

  1. Sporangium broadly pyriform, with a single discharge papilla......R. manoense

Sporangium ovoid.................................................................................5

  1. Sporangium ovoid with two discharge papillae..........................................6

Sporangium ovoid with single discharge papillae.......................................7

  1. Resting spore wall thick, with columnar bands of refractive material.............
    ....................................................................................... R. columnaris

Resting spore wall thick but without columnar bands..................R. oblongum

  1. Endobiotic part a haustorium..................................................R. irregulare

Endobiotic part branched rhizoids ..........................................................8

  1. Organism parasitic on cysts of Uroglena...................................R. venustum

Organism parasitic on diatom Stephanodiscus.........................R. horizontale



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