PART 1

immersis clypeo lato et microconidiis 7-8 × 0.5 µm.
Type. TEXAS. Houston, on Taxodium distichum, 1869, Ravenel 60 (FH-Tuck 4022, holotype; US, isotype; FH,
MICH, PH, US, isotypes?).
Forming a whitish blotch on bark of Taxodium. Ascomata subglobose, immersed, 0.2-0.3 mm diam. with
a broad clypeus; wall poorly melanized. Asci cylindrical, 100-130 × 14-20 µm, with 8 nearly uniseriate to
subbiseriate spores. Ascospores narrowly ovate to narrowly elliptical, 20-28(-32) × 6-8(-9.5) µm, smooth.
Microconidia 7-8 × 0.5 µm.
Arthopyrenia taxodii is distinctive in the immersed ascomata and substrate. Most species of
Arthopyrenia occur on smooth bark of hardwoods. It seems closer to the "Peltosphaeria" group of Julella than
to the rest of Arthopyrenia.
Additional specimens. FLORIDA. Duval County: Jacksonville, [Calkins] (MICH); Seminole County: Sanford,
Rapp s.n. (FLAS), 11 May 1932, Rapp 29 (FLAS), Upsala, 11 May 1932, Rapp 2014 (FLAS, MICH).
Arthopyrenia texensis (Cooke) D. Hawksw.
I have not seen the specimen involved and since Hawksworth's concept of Arthopyrenia was very broad,
I cannot place the species even as to genus.
JULELLA Fabre
Just as I was nearly finished with this volume, Aptroot and v.d. Boom published a paper with notes on
Julella (Mycotaxon 56:1-8. 1995). We have reviewed essentially the same group of species and come up with
very different results. Depending on one's view point, Aptroot and v.d. Boom have indulged in an orgy of
"lumping" or I have indulged in an orgy of "splitting".
As with other muriform-spored taxa, the possibility exists that Julella should be merged with its
transversely septate sister taxon, Arthopyrenia. I am reluctant to take this step as Julella is probably
heterogenous. For instance, I am sorely tempted to reinstate Peltosphaeria Berlese and some of the tropical
taxa seem to form a relatively distinct clade. Further, I am not happy with the specific level taxonomy
presented below. Many of the specimens come from dry, harsh habitats and "external" characters of clypeus
and ascomatal immersion are highly variable. Also as with many muriform-spored taxa, one is never quite
sure ascospore differences are due to genetics or age. Even worse, the microconidia, which I normally
consider a highly conservative character, don't seem to provide much help. I suspect that there are more host
specific microspecies but I do not now have either enough specimens or enough time to make sense of them.
A few names that have been placed in Julella (or Peltosphaeria) whose types I have not examined are
included in the key or commented on in the notes despite this basic ignorance.
1. Asci with 8 ascospores (rarely 1-several aborting).................................................................................... 2
2. Ascospores remaining colorless ........................................................................................................... 3
3. Asci clavate to pyriform with biseriately to irregularly arranged spores.............................................4
4. Asci narrower clavate or short-cylindrical...................................................................................... 5
5. Ascospores 24 µm long or longer ............................................................................................. 6
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