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Lichen flora of Latvia - Red List lichen species

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The following data is taken from "Red Data Book of Latvia"( volume 1, Riga,1996) and provides situation till 1996. Although all of these species are still included in the Red Data Book, new localities are found for many of them, so their status can be changed in future.

0.category - extinct species, not encountered in nature for recent 50 years.

1.	Lobaria  amplissima (Scop.) Forssell
2.	Sphaerophorus  globosus (Huds.) Vain.

1.category - endangered species, may become extinct.

3.	Bryoria  bicolor (Ehrh.) Brodo et Hawksw.
4.	Cetrelia  olivetorum (Nyl.) W. L. Culb. & C. F. Culb.
5.	Cladonia  foliacea (Huds.) Willd.
6.	Cladonia  incrassata Flörke
7.	Dermatocarpon  luridum (With.) J. R. Laundon
8.	Evernia  mesomorpha Nyl.
9.	Hypogymnia  vittata (Ach.) Parrique
10.	Lobaria  scrobiculata (Scop.) DC.
11.	Melanelia  fuliginosa (Fr. ex Duby) Essl. in Egan
12.	Nephroma  laevigatum Ach.
13.	Peltigera  venosa (L.) Hoffm.
14.	Pertusaria  flavida (DC.) J. R. Laundon
15.	Pycnothelia  papillaria (Ehrh.) Dufour
16.	Solorina  saccata (L.) Ach.
17.	Stereocaulon  condensatum Hoffm.
18.	Umbilicaria  polyphylla (L.) Baumg.
19.	Usnea  florida (L.) Weber ex F. H. Wigg.
20.	Xanthoparmelia  mougeotii (Schaer. ex D. Dietr.) Hale

2.category - vulnerable species decreasing in number.

21.	Evernia  divaricata (L.) Ach.
22.	Lobaria  pulmonaria (L.) Hoffm.
23.	Pleurosticta  acetabulum (Neck.) Elix & Lumbsch in Lumbsch
24.	Ramalina  thrausta (Ach.) Nyl.

3.category - rare species.

25.	Cystocoleus  ebeneus (Dillwyn) Thwaites
26.	Melanelia  elegantula (Zahlbr.) Essl.
27.	Menegazzia  terebrata (Hoffm.) Massal.
28.	Mycoblastus  sanguinarius (L.) Norm.
29.	Opegrapha  viridis Pers.
30.	Parmelia  omphalodes (L.) Ach.
31.	Parmelina  tiliacea (Hoffm.) Hale
32.	Pertusaria  hemisphaerica (Flörke) Erichsen
33.	Pertusaria  pertusa (Weigel) Tuck.
34.	Thelotrema  lepadinum Ach.

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