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

Liu, Pu & Li, Yu, 2017, Dictyostelids from Jilin Province, China II, Phytotaxa 323 (1), pp. 77-82 : 78-79

Dictyostelium longosporum H. Hagiw., Bull. Natn. Sci. Mus. , Tokyo, Ser. B, 9(4): 155 (1983).

Sorocarps ( Fig 1I ) solitary, unbranched, phototropic, prostrate. Sorophores colorless, sinuous, 0.5–4.6(–30) mm high, bases ( Fig 1L ) expanded, tips ( Fig 1K ) capitate, tapering from bases to tips. Sori white, globose, 75–380 μm diam. Spores ( Fig 1M ) hyaline, ellipsoid, usually 5.0–8.8 × 3.0–4.5 μm, without polar granules. Cell aggregations ( Fig 1J ) radiate in pattern, with conspicuous streams. Pseudoplasmodia do not migrate and usually produce single sorogens. Macrocysts ( Fig 1N ) 7.5–12.5 × 8.8–12.5 μm.

Cultures examined. HMJAU MR055. Strain 0075–4 isolated in 2009 from mixed forest soil (855 m elevation) collected in the Wangqing National Nature Reserve, Jilin Province, China, in the same year.

Known distribution. Nepal and China.

Commentary. From the original report ( Hagiwara 1983) of this species, the soil samples for dictyostelid isolation were collected in open forests of the temperate zone at relatively high elevations, at about 1900-2610 m. However, in the present study, the soil samples were collected at a lower elevation (about 855 m) in a middle-temperate zone, which shows that this species is affected less by elevation.

Figures

FIGURE. 1 Dictyostelium recurvibasicum and D. longosporum. D. recurvibasicum: A, B, sorocarps; C, cell aggregation; D, spores; E, sorophore tip; F, G, H, sorophore base. D. longosporum: I, sorocarps; J, cell aggregation; K, sorophore tip; L, sorophore base; M, spores; N, macrocysts. Bars: A = 5 mm; B = 3 mm; C, J = 2 mm; D–H, K–N = 10 μm; I = 10 mm.