Rudolgaea Potemkin & Vilnet, 2021

Potemkin, A. D. & Vilnet, A. A., 2021, Reappraisal of Gymnocolea and description of a new genus Rudolgaea (Anastrophyllaceae, Marchantiophyta), Arctoa 30 (2), pp. 138-148 : 144

Rudolgaea Potemkin & Vilnet , gen. nov. Figs. 3–6

Diagnosis: Being morpholgically distinct in habit, leaf shape and areolation from the related Hattoria and Vietnamiella it resembles Gymnocolea inflata and Odontoschisma fluitans . It differs from Gymnocolea inflata in the occurrence of some rhizoids or their fascicles from ventral leaf bases, lack of caducous perianths, outer cortical cells of larger shoots mostly ± smaller than inner stem cells, often tangentially orientated and occasionally thick-walled. It is distinct from Odontoschisma fluitans in the origin of some rhizoids or their fascicles from ventral leaf bases, distinctly striolate-papillose leaf and stem surface, and terminal furcate branching.

Type: Rudolgaea fascinifera (Potemkin) Potemkin & Vilnet ( Þ Gymnocolea fascinifera Potemkin ).

Etymology. The genus bears the name of Prof. Rudolf Mathias Schuster (Rudy) and his wife, Olga Marguerite Schuster, his permanent companion and assistant for over 60 years, from their marriage in 1943 to her death in 2005.

Figures

Fig.3. Rudolgaea fascinifera (Potemkin 92-9701, LE, holotype). A, B: habit of plants. Scales:1 mm.

Fig. 4. Rudolgaea fascinifera (Potemkin 92- 9701, LE, holotype). A–D: leaves; E: dorsal cortical cells; F: basal leaf cells with striolate papillose surface; G: ventral leaf base with rhizoids. Scales: A, B: 160 µm, C, D: 125 µm, E, F: 25 µm, G: 100 µm.

Fig. 5. Rydolgaea fascinifera (Potemkin 92- 9701, LE, holotype).A–C: cells of leaf lobe apex, leaf middle and base, respec- tively; D–F: stem trans- verse sections; G: ventral cortical cells of stem. Scales: A–C: 25 µm, D–F: 80 µm, G: 18 µm.

Fig. 6. Rudolgaea borealis (Troeva G1-138, LE). A, B: shoot sectors; C: lobe; D, F: stem transverse sections; E: basal leaf cells. Scale bars: for A, B: 750 µm; C: 18 µm; D, E: 30 µm; F: 19 µm. From Potemkin et al. (2021).