PART 1

West Virginia ...............................................................................................[A. degelii R. C. Harris]
11. Ascospores (13-)15-26 × 4.5-9 µm; cells usually with stong constrictions................................ 12
12. Ascospores with both ends rounded, 18-22 × 7-8(-9) µm; upper
cell usually somewhat larger; asci 60-80 × 17-22 µm; microconidia
10-12 × 0.5 µm; rare, Vermont, Newfoundland, California and
Oregon .........................................................................[A. cinereopruinosa (Schaerer) Massal.]
12. Ascospores with one or both ends pointed, (13-)15-20 × 4.5-6.5(-7.5) µm;
cells ± equal; asci 75-110 × 12-18 µm; microconidia 10-12(-15) × 0.5 µm;
Pacific Northwest...............................................................[A. plumbaria (Stizenb.) R. C. Harris]
1. Ascospores 4-celled................................................................................................................................ 13
13. Ascospores less than 25 µm long ..................................................................................................... 14
14. Ascomata immersed, the tip surrounded by a broad clypeus often
confluent with others; ostiole surrounded by a whitish ring;
ascospores 17-22 × 6-8 µm; microconidia 6-9 × 0.5 µm;
Dade and Monroe counties ......................................................................A. confluens R. C. Harris
14. Ascomata lacking a broad clypeus, not confluent; ostiole not
surrounded by a whitish ring; ascospores 17-23 × 6-7.5 µm;
microconidia 10-13 × 0.5 µm; reported from British Columbia
by Noble et al., 1987............................................................................[A. cerasi (Schrader) Massal.]
13. Ascospores 28-40(-45) × 9-12(-15) µm, with distinct granular ornamentation
and thick gelatinous epispore; microconidia 9-12 × 0.5 µm; Collier, Dade
and Monroe counties ................................................................................. A. exasperata R. C. Harris
NOTES
Much of the information for this genus comes from my unpulished thesis (1975). To avoid possible
confusion I have tried to account for all of the names included in it. The synonymy from the thesis and that
accumulated in the 20 years since is also given.
Arthopyrenia analepta (Ach.) Massal.
Ric. auton. lic. crost. 165. 1852. Lichen analeptus Ach., Lichenogr. suec. prodr. 15. 1798. Type.
SWEDEN. (H-Ach 796-B, lectotype, selected here).
Arthopyrenia lapponina Anzi, Comment. Soc. Crittogam. Ital. 2: 25. 1864. Type. ITALY. Bormio,
Anzi, Lich. Lang. 347 (FH-Tuck 4084, isotype).
Verrucaria epidermidis var. fallax Nyl, Bot. Notiser 1852: 178. 1852. Verrucaria fallax (Nyl.) Nyl.,
Flora 55: 363. 1872. Arthopyrenia fallax (Nyl.) Arnold, Verhandl. Zool.-Bot. Ges. Wien 23:
505. 1873. Type. FINLAND. Holmia, Nylander (H-Nyl 955, holotype).
Pyrenula punctiformis var. fallax f. betulae Hepp, Flecht. Eur. 452. 1857. Type. SWITZERLAND.
Zürich, Hepp (FH, isotype)
Arthopyrenia fallax f. crategina Steiner in Zahlbr., Ann. Naturhist. Hofmus. Wien 24: 283. 1911.
Type. YUGOSLAVIA. "Ad litus meridionalis lacus "Veldser See", Steiner, Krypt. Vind. 1763a
(FH, US, isotypes).
The material in the Acharian herbarium under Verrucaria analepta contains three pieces of bark labelled
"Suecia" (marked A, B, C) and therefore candidates for the lectotype. Pieces A and C lack ascospores but the
hamathecium is of the "Naetrocymbe-type". Piece C also has microconidia in accord with Naetrocymbe.
Piece B has hamathecium, asci, ascospores and microconidia identical to those of the species currently
known as Arthopyrenia lapponina. I have selected Piece B as the lectotype as it contains good material of
both teleomorph and anamorph and to stabilize the usage of Arthopyrenia in the broadest possible sense (see
74