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

Liu, Pu & Li, Yu, 2017, Dictyostelids from Jilin Province, China II, Phytotaxa 323 (1), pp. 77-82 : 80

Dictyostelium brefeldianum H. Hagiw., Bull. Natn. Sci. Mus. , Tokyo, Ser. B, 10(1): 39 (1984).

Sorocarps ( Fig 2G ) solitary, usually unbranched, phototropic, prostrate. Sorophores colorless, sinuous, 0.6–4.5(10.5) mm long, tapering from bases to tips, usually consisting of one tier of cells except for the bases and tips, bases ( Fig 2H ) conical or round, tips ( Fig 2I ) capitate. Sori white, globose, 25–230(280) μm diam. Spores ( Fig 2J ) hyaline, oblong, mostly 5.3–7.3 × 3.0–4.0 μm, without polar granules, sometimes with irregular granules. Cell aggregations radiate. Pseudoplasmodia do not migrate, usually producing single sorogens. Myxamoebae ( Fig 2K ) irregular or triangular in the direction of movement.

Cultures examined. HMJAU MR043. Strain 0081–2 isolated in 2009 from mixed forest soil (861 m elevation) collected in the Wangqing National Nature Reserve, Jilin Province, China, in the same year.

Known distribution. U.S.A., Canada, Germany, England, France, Denmark, Switzerland, Japan, New Guinea, Nepal, Uganda, Ukraine, Korea, and China.

Commentary. Dictyostelium brefeldianum is a medium-sized cosmopolitan species that is often prostrate and strongly phototropic. This study extends its worldwide distribution in China.

Figures

FIGURE. 2 Polysphondylium tenuissimum (A–F) and Dictyostelium brefeldianum (G–K): A, G, sorocarps; B, H, sorophore base; C, sorophore branch; D, I, sorophore tip; E, J, spores; F, macrocysts; K, myxamoebae. Bars: A = 2 mm; B, C, D, E, F, H, I, J, K = 10 μm; G = 3 mm.