British fungi - Keys

The genus Microthyrium

by Paul Kirk

 

 

 

1

Asci 4-spored; ascospore appendages both apical and median

macrosporum

 

Asci 8-spored; ascospore appendages either apical, median or absent

2

2(1)

Ascospore appendages either apical, median

3

 

Ascospore appendages absent

10

3(2)

Ascospore appendages apical

4

 

Ascospore appendages median

6

4(3)

Ostiolar collar absent

ilicinum

 

Ostiolar collar present

5

5(4)

Cell of thyrothecium quadrilateral; ascospores 2𣠵 祄 wide

microscopicum

 

Cell of thyrothecium elongate; ascospores 3򉣺5 祄 wide

versicolor

6(3)

Ostiolar collar dark

lauri

 

Ostiolar collar absent

7

7(6)

Thyrothecium margin fringed; ascospores ellipsoid

pinophyllum

 

Thyrothecium margin wavy; ascospores obclavate to ellipsoid

8

8(7)

Thyrothecium margin fringed; ascospores ellipsoid

gramineum

 

Thyrothecium margin wavy; ascospores obclavate to ellipsoid

9

9(8)

Ascospores 810 祄 long

ciliatum var. hederae

 

Ascospores 12򉣷45 祄 long

ciliatum var. ciliatum

10(2)

Ostiolar collar raised and dark

inconspicuum

 

Ostiolar collar absent

11

11(10)

Thyrothecium < 150 祄 diam., margin entire; ascospores < 10 祄 long

fagi

 

Thyrothecium > 150 祄 diam., margin fringed; ascospores > 10 祄 long

12

12(11)

Ascospores 12145 34 祄

cytisi var. ulicis

 

Ascospores 1419 3𣴡 祄

cytisi var. ulicis-gallii

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