Dictyostelium gracile H. Hagiw., Bull. Natn. Sci. Mus.

Liu, Pu & Li, Yu, 2014, Dictyostelids from Jilin Province, China. I, Phytotaxa 183 (4), pp. 279-283 : 280

Dictyostelium gracile H. Hagiw., Bull. Natn. Sci. Mus. , Tokyo, Ser. B, 9(4): 150 (1983).

Sorocarps ( Fig 1F ) solitary or gregarious, not phototropic, rarely branched, prostrate. Sorophores colorless, sinuous, 0.5–5.5(6) mm high, gradually tapering from bases to tips, bases clavate, tips blunt or hair-point, consisting of a single tier of cells except bases. Sori white, globose, 20–180 µm diam. Spores ( Fig 1G ) hyaline, ellipsoid, usually 5.6–7.3 × 2.7–3.6 µm, with conspicuous polar granules. Cell aggregations of three types, without cell stream and one aggregation forms one sorocarp, with sheet-like cell streams and one aggregation forms one or several sorocarps, and with radiate cell streams and one aggregation forms many smaller subcenters which produce sorocarps.

Cultures examined. HMJAU MR047 . Strain 0446–2 isolated from broad leaved forest soil collected in Jingyue, Changchun City, Jilin Province, China .

Known distribution. Nepel and China. New record for China.

Figures

FIGURE 1.A–E: Dictyostelium multistipes, (F, G) D.gracile, and (H–L) D. clavatum.A, F and I are sorocarps; B and K, cell aggregations; C, sorophores; D, G and L, spores; E, myxamoebae; H, sorophore tip; J, sorophore base. Bars = (A, K) 1 mm; (B) 0.5 mm; (C, D, G, H, J, L) 10 µm; (E) 15µm; (F, I) 3 mm.