PART 1
PART 1
PART 1
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inspersed; hymenial gel IKI-. Ascospores subbiseriate to uniseriate, 4-celled, (30-)36-45(-50) × 12-17(-21)<br />
µm, with a darker pigmented median band and with a brownish apical cap at both ends (outside the exospore)<br />
which in fresh material is often reflexed looking like a little sombrero, gelatinous sheath otherwise not readily<br />
evident.<br />
Harris (1989) cited some of the collections now recognized as P. caryae under P. punctella (Nyl.)<br />
Trevisan where it was noted "The taxonomy of P. punctella requires further work...". Pyrenula caryae was<br />
initially segregated when the presence of lichexanthone was noticed. However, closer study revealed several<br />
correlated characters, the "waxy" thallus, larger ascospores with the very odd apical caps and a strong<br />
tendency to grow on Carya. Eleven of the fifteen known collections are from Carya and the species has been<br />
named for this preference. The substrate of the other four is neither noted on the label nor readily<br />
determinable. The ascospores of P. punctella are 27-38 × 12-18 µm and lack the apical caps but may have<br />
an apical dark spot in the exospore or are weakly apiculate with the apiculus often darkening. Also older<br />
ascospores tend to have a paler zone around the locules not seen in P. caryae. Pyrenula punctella is still<br />
probably not homogeneous. The Coastal Plain collections, mostly on Fraxinus or Magnolia, have a reddish<br />
almost endophloeodal thallus, interior collections, mostly on Fagus, have a whitish or grayish dull epiphloeodal<br />
thallus but I am not as yet prepared to separate them at the species level in a group where the intimate<br />
relation between lichen and substrate give rise to great differences in aspect. Three collections of P. caryae<br />
seem to lack lichexanthone entirely. In fact one of the three collections made at the type locality lacks<br />
lichexanthone. Overall it seems present only in low quantities as the fluorescence is quite weak. Presence or<br />
absence of lichexanthone is sometimes recognized at the specific rank but the unique ascospores allow one<br />
to dismiss such a treatment here. The known distribution of P. caryae may also be distinctive, running in an<br />
arc around the Southern Appalachians from North Carolina to Missouri mainly on the Piedmont although like<br />
P. caryae several also extend into northern Florida. The elevations noted are between 35 m and 900 m.<br />
Gomphillus americanus also fits this pattern and also possibly Cladonia caroliniana Tuck. s. lat. (if usnic acid<br />
only strain is included) and Cresponea premnea (Ach.) Egea & Torrente var. saxicola (Leighton) Egea &<br />
Torrente.<br />
Additional specimens. ALABAMA. Cleburne County: 2 mi NE of Heflin, 23 Oct 1964, Johnson<br />
(NY);Tuscaloosa County: near Rickey, 24 Oct 1964, Johnson (NY). ARKANSAS. Washington/Crawford County:<br />
Devil's Den State Park, 9 Jun 1961, Johnson (NY). FLORIDA. Holmes County: along St. Rd. 2 just E of<br />
Choctawhatchee River, 10 Dec 1993, Buck 24686 (NY). GEORGIA. Towns/Rabun County: Chattahooche<br />
National Forest, along Appalachian Trail between Dick's Creek Gap and Little Bald Knob, 825-900 m, 21 Sep<br />
1992, Harris 28115 (NY). MISSISSIPPI. Itawamba County: Donivan Slough, Mile 283.3 along Natchez Trace, c.<br />
35 m, 28 Sep 1992, Harris 28633 (NY); Lee County: near Tupelo, 31 Dec 1952, Johnson 1041A, 1046B (NY);<br />
Pearl River County: 1 mi S of Carriere, 14 Jun 1939, Johnson 1118 (NY). MISSOURI. Carter County: Bluff on E<br />
side of Current River across from Big Spring S of Van Buren, 23 Sep 1990, Harris 25633 (NY); Iron County: as<br />
type, Harris 31190, 31204 (NY). NORTH CAROLINA. Graham County: Horse Cove Campground, Nantahala<br />
National Forest, 3 Oct 1987, Buck 15387 (NY); Haywood County: Great Somky Mtns. Natl. Park, Big Creek,<br />
45 mi ESE of Knoxville, 2000-2300 ft, 25 Aug 1977, Wetmore 29850 (MIN); Macon County: McDowell<br />
Mountain, Nantahala National Forest, 640-945 m, oak-hickory woods, 12 Aug 1994, Harris 33192 (NY).<br />
SOUTH CAROLINA. Chester County: Chester, [Green?] (NY).<br />
Pyrenula concastroma R. C. Harris, sp. nov.<br />
Characteribus internis ut P. concatervanti sed ascomatis inclusis in pseudostromatis trypethelioidibus.<br />
Type. PUERTO RICO. Salinas de Guánica, 27 Dec 1930, Britton & Britton 9602 (NY, holotype).<br />
Thallus grayish brown, corticate, not pseudocyphellate, UV-. Pseudostromata sessile, constricted at<br />
base, mostly oval, ca. 2 × 1 mm, occasionally fused into larger groups, brown, filled with large oxalate(?)<br />
crystals and a whitish powder bleeding yellow in KOH. Ascomata many/pseudostroma with apical ostioles.<br />
Hymenium not inspersed. Hymenial gel IKI+ orangish. Asci with 8 biseriate ascospores. Ascospores 4-<br />
102