Key to the species of Rhizoclonium

1 Cells mostly 200 - 400 Ám diam.; rhizoidal branchlets frequent, non-septate or divided into 3 - 4 short cells R. grande
1 Cells less than 100 Ám diam 2
2 Plants in large mats or skeins, on mud or free-floating; rhizoidal branches few or lacking; filaments often less than 50 Ám wide R. riparium
2 Plants variable in appearance and habitat; rhizoidal branchlets usually present, some rebranched; filaments often 50 - 100 Ám wide R. africanum

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