Nuytsia
The journal of the Western Australian Herbarium

Based on morphological characters and molecular analysis of the nrITS regions, Marasmius australotrichotus F.E.Guard, J.Dearnaley & T.Lebel, the first known Australian species in sect. Sicci, ser. Spinulosi is described. The distribution of M. paratrichotus is extended from the West African island nation of São Tomé and Príncipe (ST&P) to Christmas Island (CI) and northern Western Australia (WA). Classification, distinguishing characters, habitat variability, geographic distribution and possible dispersal mechanisms are discussed.

The taxonomy of several species of Goodenia with connate bracts allied to G. panduriformis (A.Cunn. ex Benth.) K.A.Sheph. was evaluated through morphological assessment of herbarium specimens. Consequently, the circumscriptions of G. connata (F.Muell.) K.A.Sheph., G. discophora (F.Muell.) K.A.Sheph., G. daviesii (F.Muell.) K.A.Sheph. and G. panduriformis are revised and new descriptions provided. Three new species, G. aluta K.A.Sheph. & Lepschi, G. crescentiloba K.A.Sheph. & Lepschi and G. obscurata K.A.Sheph. & Lepschi are also recognised, the latter being listed as a species of conservation concern. Further, a replacement lectotype for Velleia helmsii K.Krause is designated and a key, distribution maps and figures are included.

The Australian hummock genus Triodia R.Br. is currently undergoing taxonomic revision in light of new collections from surveys of remote Australia and increased resolution provided by molecular methods. This paper describes four new species of Triodia from the Pilbara and adjacent IBRA bioregions: T. avenoides M.D.Barrett, T. degreyensis M.D.Barrett, T. karijini M.D.Barrett & S.J.Dillon, and T. lutiteana M.D.Barrett & P.-L.de Kock. All four species are ‘soft’ spinifexes with elongate glumes and lemma lobes subulate to awned, and are only known from the Pilbara and adjacent Carnarvon and Gascoyne regions of Western Australia. Triodia degreyensis is known from a single range system in the north-eastern Pilbara. The taxon formerly known by the phrase name T. sp. Karijini (S. van Leeuwen 4111) is formally described here as T. karijini, and is restricted to mountains above 900 m altitude in the eastern Hamersley Range. Triodia lutiteana is only known from shale substrates north-west of Tom Price, and may be a polyploid species. The new species T. avenoides is segregated from T. schinzii (Henrard) Lazarides based on morphological and molecular differences and a disjunct distribution on sand sheets and dunes of the Carnarvon basin. The central Australian species T. helmsii (C.E.Hubb.) Lazarides is newly synonymised with T. schinzii, since no clear morphological or genetic differences between the two could be established. An amended description of T. schinzii is provided to accommodate these alterations to the species concept. Diagnostic character combinations for each species are given to allow discrimination from all other Triodia species. Triodia degreyensis, T. karijini and T. lutiteana are known from between one and four localities, and have priority conservation statuses, while T. avenoides and T. schinzii are not considered threatened. With the species described here, a total of 29 species and one hybrid are now known from the Pilbara bioregion and its immediate surrounds.