Catasetum × dalastranum Petini-Benelli & Chiron (2018: 13)

Krahl, Dayse Raiane Passos, Schmal, Philippe, Chiron, Guy, Silva, João Batista Fernandes Da, Krahl, Amauri Herbert & Cantuária, Patrick De Castro, 2023, Catasetum × grasineideae (Orchidaceae: Catasetinae), a new nothospecies from Brazilian Amazon and taxonomic notes for the genus, Phytotaxa 594 (2), pp. 89-104 : 96-98

2. Catasetum × dalastranum Petini-Benelli & Chiron (2018: 13) (pro. sp.), nothosp. nov.

( Figure 6C ).

Types:— BRAZIL. Mato Grosso: Sinop , 15 km da estrada da cidade, 7 february 2012, Plácido Dalzotto APB961 (holotype: HERBAM, photograph!) .

Taxonomic Note: —This taxon is in fact the natural hybrid between C. juruenense Hoehne (1915: 55) and C. matogrossense Bicalho (1964: 1) because of some data which have been stressed by Petini-Benelli & Chiron (2018). First, C. × dalastranum has a certain phenotypic plasticity, which is common in hybrids and was highlighted by Petini-Benelli & Chiron (2018). The lip may vary, being sometimes more closed (as in C. matogrossense ) sometimes more open (as in C. juruenense ). Besides it has internal carinae much similar to those observed in C. matogrossense . In addition, we can also note that C. juruenense and C. matogrossense share the same ecological niche which makes possible the crossing between them.Another important and relevant factor is the result of the artificial crossing between C. juruenense and C. matogrossense that we obtained from a commercial nursery in Brazil ( Figure 6C ). In this artificial obtaining, we observe the same characteristics pointed out by Petini-Benelli & Chiron (2018).

Petini-Benelli & Chiron (2018) primarily rule out the possibility of hybridization because C. × dalastranum produces resupinate flowers while C. matogrossense shows non-resupinate ones. However, it is a feature inherited from C. juruenense that also has resupinate flowers (see Petini-Benelli 2014). The other differences, such as for example width of sepals and petals, depth and dimensions of the lip, may be due to combination of characters of C. juruenense and C. matogrossense , the result of which is unpredictable (Rieseberg & Ellstrans 1993).

Additional specimens examined:— BRAZIL. Mato Grosso: Alta Floresta , próximo à área urbana, 15 march 2010, A. Grade & A. Petini-Benelli 35APG (paratype UFMT-30849 , photograph!); Nova Cana ã do Norte, entrada da cidade, em árvores remanescentes de área desmatada para formaç ã o de pastagem, 07 february 2012, A. Grade & H.S. Lima APB962 (paratype HERBAM, photograph!); Itaúba, na margem da BR sentido Sinop, 10 february 2017, S.M. Araújo APB1148 (paratype HERBAM, photograph!) .

Figures

FIGURE 6. Hybrid Catasetum. A–B. C. × aripuanense. C. C. × dalastranum. D. C. × fergusonii. E–F. C. × mojuense. G–H. C. × yarigii. Photos A–B, D and G–H by J. Fernández G., C by F. Godoy and E–F by E. Pontes.