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14-11-2024 12:06

carl van den broeck carl van den broeck

On November 8th I found very small orange discs st

14-11-2024 15:31

Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Que pensez-vous de ce Sc

14-11-2024 04:18

Götz Palfner Götz Palfner

Dear community, is this Nemania carbonacea? Micros

14-11-2024 00:34

B Shelbourne B Shelbourne

• Apothecia with predominantly yellow or brown h

11-11-2024 23:17

B Shelbourne B Shelbourne

• Macro and habitat suggest Hyaloscyphaceae s.l.

12-11-2024 16:43

Ethan Crenson

Hello all, This weekend a friend found these dark

13-11-2024 08:01

Stephen Martin Stephen Martin

I am revising some old material again and I have t

10-11-2024 17:09

Malcolm  Greaves Malcolm Greaves

This Geoglossum has 7 septate spores 75-90 long. T

09-11-2024 16:41

Stephen Martin Stephen Martin

Hello everyone, we have recently published a paper

11-11-2024 14:05

Edouard Evangelisti Edouard Evangelisti

Bonjour le forum, Je sollicite votre avis concern

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Trichopeziza sulphurea on Urtica dioica
B Shelbourne, 14-11-2024 00:34
B Shelbourne• Apothecia with predominantly yellow or brown hairs (exudate) on the same small piece of stem, one apo with yellow hairs examined.
• Macro and habitat suggest Trichopeziza, confirmed by micro.
• Spores and exudate seem to suggest Trichopeziza sulphurea.
• The browner ones have more or less yellow at the margin and there was brown exudate in micro, but there is a separate folder for 'cf. brown exudate'.

Habitat: On a dead steam of Urtica dioica, in undergrowth, wooded area, damp and shady, in a small valley, 54 m alt., Benfield Hill Nature Reserve, South Downs, southern England, early-November.

Apothecia: 2 yellow, ~10 brownish, gregarious to 3-caespitose, nest-like appearance, greyish with long and bright yellow or brownish hairs, diameter < ~2 mm, sessile, superficial.

Low magnification: Initially globose and covered with hairs, becoming more cupulate when the receptacle opens, receptacle brownish-grey, somewhat translucent, disc becoming lighter, more whitish, appears concave, many long hairs projecting from the margin and receptacle, apparently longer at the margin, sulphureous at the margin and upper flanks and brownish below, or just the margin sulphureous and flanks brownish, agglutinated in large clumps, margin remaining raised with marginal hairs erect or enclosing the disc.

Asci: Turgid ~100-110 x 9.5-10.5 µm, 2-4-seriate, simple septa, rings rb, occasionally dirty pre-KOH, Calycina-type, ascoplasm medium dextrinoid when mature.

Spores: Long and narrow, cylindrical-allantoid, 0-3 (5?) septate, some septate in asci, multi-guttulate, filled with many small guttules and some medium-size ones, OCI 4-5, very sensitive and guttules coalescing almost immediately in water, and becoming narrower (~2-3 um).

Free living spores in water or mature asci:
(30.0) 31.1-38.3 (39.8) × (3.0) 3.2-3.5 µm, Q = (8.9) 9.2 - 11.9 (12.0), N = 10, mean = 33.9 × 3.3 µm, Qe = 10.4.

Paraphyses: Lanceolate, apex rounded, width ~3.5-4.5 µm, apical cell often longer, up to 3x longer than cell below, filled with a hyaline refractive VB (Calycina-type), also with a narrow ellipsoid inclusion (SCB?), no branching observed above the base.

Hairs: ~150-170 x 4-5 µm, gradually tapering to a rounded end, more acute when mature, multi-septate (~10?), cells becoming longer towards the apex, sometimes cells more sub-globose around the base, surface appears slightly rough or pruinose, walls hyaline but appear to have some chlorinaceous contents (pre-exudation), with lots of brownish to yellowish-greenish (sulphureous) resinous exudate, more reddish-brown around the base of the hairs, remaining as many medium-size globose to pyriform drops attached to the hairs.

Medullary: Possibly text. porrecta.

Ectal: Text. globosa-angularis to prismatica, appears hyaline at the base and reddish-brown above, smaller cells around the bases of the hairs, more prismatica near the margin.
  • message #80662
  • message #80662
  • message #80662
Hans-Otto Baral, 14-11-2024 11:06
Hans-Otto Baral
Re : Trichopeziza sulphurea on Urtica dioica
Yes, an easy species. The brown ones in the separate folder are very probably not distinct.