Dasyspora segregaria Beenken

Gomes, Gardênia Figueiredo, Sotão, Helen Maria Pontes, Dealmeida, Layse Barreto, França, Isadora Fernandes De & Monteiro, Josiane Santana, 2025, Dasyspora (Pucciniales) on Xylopia in the Amazon, with new distribution records for Brazil, Phytotaxa 697 (1), pp. 68-82 : 74-75

Dasyspora segregaria Beenken , in Beenken, Zoller & Berndt, Mycologia 104(3): 672 (2012). Figs. 4 , 8B

Holotype: on X. aromatica , 1 February 1947, Trinidad and Tobago, Trinidad Island, Imperial College of Tropical Agriculture , Fungi of Trinidad ( B. W. I.), No. 1067, Mount St Benedict, R. E. D. Baker ( BPI 853915 ). Mycobank number: 519382.

Spermogonia subepidermal, group VI, type 5. Aecia and uredinia unknown. Telia abaxial on leaves, erumpent, dark brown, densely aggregated on yellowish bleached leaf spots arranged in concentric circles or scattered. Paraphyses rare, peripheral, clavate at the tips. Teliospores 2-celled, ellipsoid (30–32.5 × 20–30 µm), septum transverse, wall ornamented with hemispherical warts (1–2 µm), septum region with a smooth band (1–2 µm thick); apical and basal rod-like projections branched at the tip (3.5–10 × 1.5–2 µm); pedicel fragile, hyaline, usually brittle.

Specimen examined:— BRAZIL. RONDÔNIA: Vilhena, Fazenda Asa Branca, on X. aromatica , 01 June 1997,

I.S. Miranda & P.J.D. Silva (MG159533).

Additional specimen:— PERU. TAPAROTO: on X. aromatica , 19 December 1959, A.C. Batista & R. Garnier (MG020590 = PUR 65597 = F8697).

Host and distribution in South America:— On leaves of X. aromatica in Panama, Peru, Trinidad, Venezuela ( Beenken et al. 2012). In this study, we present the first record for Brazil, from Rondônia.

Comments:— According to Beenken et al. (2012), this species does not differ in morphology in relation to D. gregaria , but only by DNA sequences and in terms of host species, as previously mentioned in the comments of D. gregaria , but in this study we did not find specificity of host species. The SEM and OM analyses and illustrations by Beenken et al. (2012) enabled the observation that the smooth area of the septum region in D. gregaria is larger (3–5 µm) than in D. segregaria (1–2 µm). Thus, we suggest that this morphological characteristic is helpful in differentiating the two species. The specimen studied is a duplicate of a voucher specimen analyzed by Beenken et al. (2012). A duplicate of D. segregaria (MG020590) from Peru is deposited in the fungi collection of MG, cited by Beenken et al. (2012).

Figures

FIGURE 4. Dasyspora segregaria. A–B. Telia on Xylopia aromatica. A. Telia in stereomicroscope; B. Telia in SEM; C. Teliospores in OM; D. Teliospores in SEM. Bars: A= 0.5 mm, B= 50 µm, C, D= 10 µm.

FIGURE 8. Teliospores from specimens of the Dasyspora gregaria clade from the Amazon, observed under OM and SEM. A) D. gregaria (MG 173306), B) D. segregaria (MG 020590), C) D. echinata (MG 171764). Bars: 10µm.