Phytotaxa

**A new species of Gymnopus sect. Androsacei (Omphalotaceae, Agaricales) from China**

2021-09-23T12:24:30+12:00

A new species of Gymnopus sect. Androsacei, namely, G. pallipes is described and illustrated based on morphological and molecular phylogenetic evidence. It is characterized by marasmioid basidiomata, a dark brown to reddish brown pileus becoming dull white to yellowish grey with age, whitish to pale yellow stipe and presence of rhizomorphs. Phylogenetic analyses support it as a new species within Gymnopus sect. Androsacei. The detailed morphological description, colour photos of basidiomata, and line drawings of microcharacters are presented and delimitation characters from similar species are discussed. A key to the known species of Gymnopus s. str. from China is also provided.

**Distinctive morphological characteristics of Fucus guiryi (Fucales, Phaeophyceae) from Canary Islands, subtropical eastern Atlantic Ocean**

2021-09-23T12:24:32+12:00

The brown macroalgae in the order Fucales include foundation species on rocky habitats of temperate regions. This work focused on Fucus guiryi, a recently described species segregated from F. spiralis in a molecular basis. It inhabits the upper intertidal zone from the eastern North Atlantic to the subtropical Canary Islands, where is considered its southern limit. We examined morphology and anatomy of vegetative and reproductive structures of F. guiryi from the Canary Islands. Several distinctive characteristics in habit existed between F. guiryi and other species of the genus distributed northwards, such as length and width of stipe and branches, number of branches, and morphology and number of receptacles. Anatomical features reported here for the first time exhibited subtle differences with temperate F. vesiculosus, F. spiralis and F. serratus. The morphology and arrangement of medulla, cortex and meristoderm were also distinctive for F. guiryi. Mucilage in cellular interstitial spaces constitutes good evidence that explains the presence of F. guiryi at its warmest distribution limit in the Canary Islands.

Rumohra ponceana (Polypodiales: Dryopteridaceae): a new species from Pampean biogeographic province in Argentina

2021-09-23T12:24:34+12:00

The fern Rumohra ponceana sp. nov., a narrow endemic of the Austral Pampean district, Pampean biogeographic province in Argentina, is described and illustrated. The species inhabits the Tandilia and Ventania Systems, where it grows in sunny rock crevices. The new species differs from the widespread R. adiantiformis (sensu lato) by the reduced size of all parts of the sporophyte and conspicuous capitate glandular hairs at the margins of petiole and rhizome scales. Also, there are significant differences in the architecture of the laminae, the colour and size of the spores and the ornamentation of the perispore, which is folded in R. ponceana and projects in irregular tubercles throughout its surface.

**A NEW SPECIES OF DICHAEA (ORCHIDACEAE: ZYGOPETALINAE) FROM THE ANDES OF COLOMBIA**

2021-09-23T12:24:36+12:00

A new species of Dichaea sect. Dichaea from the Andean forests in Colombia is described and illustrated based on living material. Dichaea andina is compared with the morphologically similar D. lagotis and D. pendula, from which it can be distinguished by a number of vegetative and floral and features. Dichaea andina differs from D. lagotis in the broadly anchoriform lip, the hypochile transversely subrounded and the epichile transversely narrowly elliptic, briefly apiculate. Similarly, it differs from D. pendula in the caespitose habit, the leaves without cross-venation, and the inflorescence straight produced below the foliage, among other features. Ecological information for the new species is also provided.

**A New Species of Adesmia (Leguminosae, Papilionoideae, Dalbergieae) from Southern Brazil, with Notes on Leaf Anatomy**

2021-09-23T12:24:37+12:00

A revisional taxonomic study of Adesmia subg. Adesmia ser. Bicolores has unveiled a new species from southern Brazil. Adesmia miottoae is described and illustrated here. Its geographic distribution, phenology, conservation status and morphological similarities with its closest relatives, Adesmia punctata and A. incana, are presented. The species is distinguished by glandular trichomes covering all the aerial parts of the plant, except the corolla. These trichomes are shorter than those of Adesmia punctata. Additionally, a detailed anatomical description of the leaflet blade is provided.

**Effective typification of Ophrys apifera (Orchidaceae; Orchidoideae)**

2021-09-23T12:24:39+12:00

Ophrys apifera Hudson was previously considered to have been lectotypified by Künkele and Baumann in 1998 with an illustration published by Matthias Lobel in 1581. However, Hudson did not include any references to Lobel in the protologue. Therefore, the typification by Künkele and Baumann is here briefly discussed and superseded because is being contrary to Art. 9.3 of the International code of nomenclature for algae, fungi, and plants (Shenzhen Code). The name is lectotypified here with an illustration published by Bauhin and Cherler in 1651. Unfortunately, this illustration does not show several diagnostic characters to distinguish O. apifera from other related species. Therefore, for a precise circumscription of the name, an epitype is proposed of a complete specimen preserved at K.

Rigiolepis argentii (Ericaceae): a new species from Sulawesi, Indonesia

2021-09-23T12:24:41+12:00

A new species of Rigiolepis (Ericaceae) from the island of Sulawesi, R. argentii Mustaqim & Ardi, is described. The new species is known from three locations, two in Sulawesi Selatan Province (Mount Sesean in Toraja Utara Regency and Eran Batu in Enrekang Regency) and one in Sulawesi Barat Province (Mamasa Regency). This species is similar to R. moultonii (Merr.) J.J. Sm., but differs by the persistent hairs on the abaxial surfaces of the leaves, the basal marginal glands in a shorter distance (1–2 mm) to from the petiole, bracteoles borne on the lower half of the pedicels, cup-shaped calyx tube, longer filaments (2 mm), and cupular fruits.

Zhao, F., Min, D.Z., Xiang, C.L., Chen, B., Zhou, X.X., Liu, B. & Li, B. (2021) Morphological evidence for the conspecific status of the rediscovered Mimulicalyx rosulatus and M. paludigenus. Phytotaxa 520 (1):106–112.

2021-09-23T12:24:42+12:00

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