Français English

Gyalecta jenensis var. macrospora forma

Synonyms:

Family: GYALECTACEAE

Habitat: Xeric supralittoral  zone

Description

    Differs from Gyalecta jenensis var. macrospora by its thallus, mostly inconspicuous or limited to minute dark-brown fragments only visible under magnifying lens. We differentiate two sub-forma:

_ One form with apothecia lying on a blackish biofilm of cyanobacteria (Nostoc) in addition to Trentepohlia, growing on micaschist rocks in the xeric zone with seawater splashes and to seaspray in exposed rocky cliffs.

_ An another form growing on armorican sandstone rocks in maritime cliffs, exposed to seaspray, without visible thallus but with abundant colonies of free Trentepohlia.

For the two : Ascii 8-spored, elongated, 115-170 x 15-20 µm according to our measurements. Ascospores very ellipsoid, muriform, colourless to faint yellow when mature, 25-37 x 11-15 µm according to our measurements. N.B. It is not known yet whether Nostoc participates to the biology of this form, or whether its presence is limited in time in order to enhance the survival probability of the Gyalecta host in this particularly hostile habitat, or even if the Nostoc is "free" and there just by chance.

N.B. Another distinctive feature: this form is always the companion of Anaptychia runcinata, with which it seems to share the same habitat.







Gyalecta jenensis var. macrospora forma Le Conquet 2
Bernard BOUFFINIER



Gyalecta jenensis var. macrospora forma Le Conquet 1
Bernard BOUFFINIER



Gyalecta jenensis var. macrospora forma Pointe Saint-Mathieu 1
Joël QUERELLOU



Gyalecta jenensis var. macrospora forma Pointe Saint-Mathieu 2
Joël QUERELLOU



Gyalecta jenensis var. macrospora forma Pointe Saint-Mathieu 3
Jacques HAINE



Gyalecta jenensis var. macrospora forma Coupe apothécie Iode Pointe Saint-Mathieu 4
Jacques HAINE



Gyalecta jenensis var. macrospora forma Asques Lugol Pointe Saint-Mathieu 5
Jacques HAINE



Gyalecta jenensis var. macrospora forma Asques Bleu coton Pointe Saint-Mathieu 6
Jacques HAINE



Gyalecta jenensis var. macrospora forma Asques Melzer et Bleu Coton Pointe Saint-Mathieu 7
Jacques HAINE



Gyalecta jenensis var. macrospora forma Spores Lugol Pointe Saint-Mathieu 8
Jacques HAINE



Gyalecta jenensis var. macrospora forma Spores Lugol Pointe Saint-Mathieu 9
Jacques HAINE



Gyalecta jenensis var. macrospora forma Spores Bleu Coton Pointe Saint-Mathieu 10
Jacques HAINE



Gyalecta jenensis var. macrospora forma avec Nostoc Rouge Congo Pointe Saint-Mathieu 11
Jacques HAINE



Gyalecta jenensis var. macrospora forma Sur grès armoricain avec Anaptychia runcinata Pointe de Pen-Hir 1
Alain GERAULT



Gyalecta jenensis var. macrospora forma Sur grès armoricain Pointe de Pen-Hir 2
Alain GERAULT



Gyalecta jenensis var. macrospora forma Sur grès armoricain Pointe de Pen-Hir 3
Alain GERAULT



Gyalecta jenensis var. macrospora forma Sur grès armoricain Pointe de Pen-Hir 4
Alain GERAULT



Gyalecta jenensis var. macrospora forma Sur grès armoricain Pointe de Pen-Hir 5
Alain GERAULT



Trentepohlia aurea s.l. accompagnant Gyalecta jenensis var. macrospora forma Sur grès armoricain Pointe de Pen-Hir 6
Alain GERAULT



Gyalecta jenensis var. macrospora forma avec Trentepohlia aurea libre sur grès armoricain 7
Michel DAVID



Gyalecta jenensis var. macrospora forma avec Anaptychia runcinata Pointe de Pen-Hir 8
Michel DAVID



Return
Content : Alain Gérault - Website development : Sylvain Ard - Hosting : Online.net