British fungi - Keys

The genus Thelotrema - update in progress

1	Ascospores muriform	2
	Ascospores only transversely septate	4. subtile
2(1)	Ascospores fuscous brown to brown when mature	3
	Ascospores remaining colourless when mature	2. lepadinum
3(2)	Asci 1(–2)-spored; true exciple free; ascospores (50–)90–120(–160) × (14–)30–40(–50) µm, with 16–22(–24) transverse septa	3. monosporum
	Asci usually 8-spored; true exciple ± united with the thallus; ascospores 30–50 × 12–16(–18) µm, with 7–9(–11) transverse septa	1. isidioides

back to previous page