28-04-2024 18:05
Bernard CLESSEBonsoir à toutes et tous,J'ai trouvé ce matin ce
24-03-2024 08:27
Thierry BlondelleHiOn Hedera helix fallen branchEcological habitat:
26-04-2024 10:07
Mathias HassHello, Does anyone know what this is? Found on J
24-04-2024 21:54
éric ROMEROBonjour, J'ai trouvé ce Lasiobolus sur laissées
23-04-2024 15:18
Lothar Krieglsteiner... but likely a basidiomycete. I hope it is o.k.
23-04-2024 13:17
Edouard EvangelistiBonjour à tous, Je viens de récolter ce que je
23-04-2024 21:49
Ethan CrensonHello all, A friend recently found this orange as
22-04-2024 11:52
Zuzana Sochorová (Egertová)Hello,I made a loan of a collection of Microstoma
11-01-2022 16:36
Jason KarakehianHi does anyone have a digital copy of Raitviir A (
Bactridium flavum
B Shelbourne,
14-04-2024 22:58
• From what I can determine, a teleomorph is not known, and the genus is insertae sedis (hyphomycete).
• I struggled to find a good reference online for describing the morphology of sporodochia.
Habitat: On damaged and decaying wound on the trunk of living deciduous tree, decorticated parts, very damp when observed but presumably dries out occasionally, near the base, lower part of trunk lying on the floor, tree rooted in a small stream (often dries out in dry weather), shady area, mixed deciduous woodland, Low Weald, England (south), mid-April, after rain.
Associates: Algae, bryophytes nearby, some small plants apparently growing in detritus on the decaying wood.
Conidiomata: Sporodochia (pulvinate and short conidiophores), broadly distributed across the decorticated part, scattered to gregarious, sometimes 2-caespitose, 0.9-1.2 (1.4) mm diameter, pale whitish to bright orange-yellow (depending on density of conidia and possibly age), pulvinate to globose, formed of dense conidia giving frosted or densely warty appearance, loosely structured with soft texture, appearing to 'burst' when pressure initially applied, no anchoring hyphae or subiculum observed; conidia clearly visible under 20x magnification, translucent orangish, apical cell more opaque and whitish.
Storage and methods: Stored for ~36 hours in a damp box, structure made it difficult to section, an edge section taken from a single average-size mature looking apothecia, mounted in water, increasing pressure applied to separate cells, IKI added to water mount.
IKI: Conidia strongly dextrinoid (dark red), other cells with some yellowish contents.
Conidiophores: < 250 µm long, hyaline, smooth, multi-septate, Woronin bodies visible around the septa, several small shadowy LBs, cells ~15-30 µm long, cylindrical, tapering slightly, apical cell ~7-9 µm wide and often short, basal cell ~10-13 µm wide, regularly branching (dichotomously), septum on one side after branching, terminal branches with ~5 cells and apex developing a single conidium by blowing out the end, anastomosis regularly observed (even between terminal branches) and apparently septating, gradually vacuolising and becoming filled with medium-size hyaline vacuoles each with an LBs inside.
Conidia: Large phragmoconidia, cylindrical-ellipsoid to slightly clavate, apex rounded-hemispherical, sometimes more acute when mature, with truncate hilum, apparently with 3-4 (5) septa in maturity, occasionally Woronin bodies seen, only transverse sept observed, yellowish contents (VBs?) usually more concentrated in central cells, subapical cell often larger and sometimes cell below, many small LBs, contents deforming when dead and cells less turgid (no photos).
Measurements for vital conidia in IKI with 3-5 septa: (127) 147-167 (193) × (28) 32-35 (40) µm, Q = (3.9) 4.4-5.1 (5.2), n = 15, mean = 158 × 34 µm, Q mean = 4.7.
Base/mycelium: Pseudostroma?, hyaline, appearing partially immersed, forming a textura intricata with branching, at the edge hyphae with short protruding part similar to marginal cells.
Nicolas VAN VOOREN,
16-04-2024 19:16
Re : Bactridium flavum
Yes, this B. flavum but there exists several phylospecies under this name. They belong to the family Pyronemataceae. A forthcoming paper is in prep...
B Shelbourne,
16-04-2024 20:36
Re : Bactridium flavum
Thank you for looking and the information.
I saw this placement of the genus in iNaturalist, but I wasn't sure as I couldn't find a reference with a quick search.
At first glance, the sporodochia seem to have few characters, so I look forward to seeing the paper and some nice descriptions and depictions of the anatomy.
I saw this placement of the genus in iNaturalist, but I wasn't sure as I couldn't find a reference with a quick search.
At first glance, the sporodochia seem to have few characters, so I look forward to seeing the paper and some nice descriptions and depictions of the anatomy.