Atractocolax pulvinatus
Atractocolax pulvinatus R. Kirschner, R. Bauer & Oberw. 1999, in Kirschner et al., Mycologia, 91(3), 538-543 (1999)
Diagnosis: Basidiocarps pulvinate, hyaline, gelatinous, small, 140-740 µm diam. Hyphae 1-3 µm diam, hyaline, thin-walled, with clamps at the septa. Cystidia and hyphidia absent. Basidia clavate or cylindric, 14-25 X 3-4 µm, with three transverse septa, sometimes delimited from a stalk cell by an additional septum, each basidial cell producing only one basidiospore, sterigmata absent. Basidiospores clavate, hyaline, smooth and thin-walled, 8-12 X 4-4.5 µm, producing secondary blastospores. Secondary blastospores ellipsoid to obovoid, 5-6 X 2.5-3 µm, conjugating pairwise after dehiscence from basidiospores. Subsequent blastosporogenesis not found. Conidiogenous cells absent. Hyphae containing colacosomes visible by TEM.
Index Fungorum Number: IF459670
Figure 1. Atractocolax pulvinatus (scale bar= 10 µm). 1. Elements of the hymenium with basidia in different stages of maturity. 2. Young basidia with nuclei visible in one basidium (cytoplasm spotted). 3. Basidiospores. Some basidiospores producing secondary blastospores. 4. Secondary blastospores.
Figure 2. Transmission electron micrographs of hyphae of Atractocolax pulvinatus. 5-7. Sections through neighboring hyphae with colacosomes. 8, 9. Median sections through septal pores with minute globular elements aggregated at both sides of the pore. 10. Median section through a pore in a septum between cells with collapsed cytoplasm. Scale bars: 5 = 0.5 µm, 6-10 = 0.25 µm.
Reference:
Kirschner, R., & Bauer, R., & Oberwinkler, F. (1999). Atractocolax, a new heterobasidiomycetous genus based on a species vectored by conifericolous bark beetles. Mycologia, 91(3), 538-543
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