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Page number:474 
Remarks (internal):It might seem impossible to miss spores which are up to 86.0 µm long, but their exceptional size can easily lead to them being overlooked or discounted unless and until one is seen attached to a basidium. Previous reports of Serendipita vermifera, in Oberwinkler (1964) and Hauerslev (1976), have given rather shorter maximum spore lengths up to 60 µm, but in this unique instance the extension of the spore size by an extra 25 µm or so seems no more than a trivial variation from the type.
Jülich (1984) follows Oberwinkler (1964) in specifying named corticioid fungi as the habitat for S. vermifera, but it can and does occur quite independently on decaying wood and appears to have no particular habitat preference. The Devon collections come both from deciduous lowland limestone scrub and acidic moorland conifer plantation. The species has also been isolated from Australian orchids by Warcup Sr Talbot (1967), who note the production of loosely-arranged, unclamped vegetative hyphae in culture, occasionally producing monilioid blastospores.
 
Description type:Non-original description 
Description:Serendipita vermifera (Oberw.) P. Roberts, comb. nov.
Sebacina vermifera Oberw., Nova Hedw. 7: 495 (1964). - Exidiopsis vermifera (Oberw.) Woj., Grzyby 8: 100, Warsaw (1977).
Basidiomes not macroscopically visible. Hyphae not forming an hymenium, but trailing over or through the substrate as individual infrequently branching strands. Thin, ca 0.5-2.0 µm wide, hyaline with thin refractive walls. Clamps not seen but possibly present on the basal hyphae. Basidia 2-4 septate, globose or slightly ovoid when young, becoming subglobose to widely ellipsoid when mature, ca &5-11.5 x 6.5-10.0 µm. Apparently without a basal clamp but immature basidia occasionally with a short basal projection. Basidia normally develop singly along the main hyphae, attached at right angles by a short side-branch or sub-basidial cell. This cell becomes swollen and slightly thick-walled at maturity. New basidia arise from the sub-basidial cell or adjacent cells, the whole forming a cluster or short spike of basidia, usually 3-6 per cluster. Hyaline, partly-collapsed basidia are frequent, usually septate but apparently without sterigmata and thus possibly infertile. Sterigmata 1-4 per basidium, often rather short but sometimes extending to become tubular and sinuous, up to 23.0 µm long. Occasionally with secondary sterigmata arising from the primary sterigmata. Spores thin and exceptionally elongated, frequently replicating: 48.0-86.0 x 2.5-3.0 µm (P. Roberts, 27 Mar. 1989); (44.5-)50.0-80.0 (-86.0) x 2.0-3.0 µm (P. Roberts 91); 21.0-68.0 x 1.5-3.0 µm (P. Roberts 185); 47.0-63.0 x 2.5-3.0 µm (P. Roberts 214).
Specimens examined: on fallen decorticated Picea trunk with Botryobasidium danicum Erikss. & Hjortst., Believer Forest, Dartmoor, Devon (SX 6576), 27 Mar. 1989, P. Roberts, K; same location, on fallen Picea trunk, in hymenium of sterile, odontioid, corticioid fungus, 1 May 1989, P. Roberts 91, K; same location, on fallen Picea branch, 22 Sep. 1990, P. Roberts; same location, on fallen Picea branch with Tylospora fibrillosa (Burt) Donk and Tulasnella sp., 27 Apr. 1991, P. Roberts 213, K; on fallen Prunus spinosa branch, Orley Common, Devon, (SX 8266), 8 Dec. 1990, P. Roberts I85, K.

 
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