Great Basin Naturalist Memoirs Volume 9 A Utah Flora Article 6 1-1-1987 Division Lycopodiophyta Stanley L. Welsh Monte L. Bean Life Science Museum and Department of Botany and Range Science, Brigham Young University, Provo, Utah 84602 N. Duane Atwood USDA Forest Service, Intermountain Region, Ogden, Utah 84401 Sherel Goodrich Intermountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Ogden, Utah 84401 Larry C. Higgins Herbarium, Department of Biology, West Texas State University, Canyon, Texas 79016 Follow this and additional works at: https://scholarsarchive.byu.edu/gbnm Part of the Anatomy Commons, Botany Commons, Physiology Commons, and the Zoology Commons Recommended Citation Welsh, Stanley L.; Atwood, N. Duane; Goodrich, Sherel; and Higgins, Larry C. (1987) "Division Lycopodiophyta," Great Basin Naturalist Memoirs: Vol. 9 , Article 6. Available at: https://scholarsarchive.byu.edu/gbnm/vol9/iss1/6 This Chapter is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Great Basin Naturalist Memoirs by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. 1987 Welsh etal: A Utah Flora. Isoetaceae, Selaginellaceae 13 DIVISION LYCOPODIOPHYTA Isoetes holanderi Engelm. Bolander Quillwort. Leaves mostly 2-12 cm long, gradualK tapering from the broad base, slender, soft; hyaline margins extending to ca 1 cm Clubmosses above the sporangium; velum covering to ca 1/2 of the sporangium; megaspores 0.3-0.5 mm wide, obscurely Perennial herbs with alternation of generations, the tuberculate, ridged, or wrinkled. Ponds, lake margins, generations differentiated and ultimately independent; and sometimes on mud, at 1310 to 3205 m in Duchesne, sporophyte well developed, with roots, stems, and mi- Carheld, Salt Lake, Sevier, Summit, and Utah counties; erophylls; vascular system protostelic, without leiil gaps; British Columbia to Montana, .south to California, Ari- leaves typicalK' alternate and often spirally arranged, ei- zona, and (>olorado; 14 (i). ther scale- or grasslike, with a single, unhranched vascu- Isoetes echinospora Durieu Spiny Quillwort. Leaves lar bundle; sporangia solitary, subtended by a sporophyll, mostly 2.5-10 cm long, gradually tapering from the broad the sporophylls aggregated into a definite or indefinite base, slender, soft, straight or curved; hyaline margins strobilus; spores dimorphic (megaspores and micro- extending mostly 1-4 (5) cm above the sporangium; spores) in Utah materials. velum covering less than 1/2 of the sporangium; megaspores 0.3-0.6 wide, more or less spiny with Key to the Families mm blunt, truncate, or bifid spines; n = 21. Ponds, lake 1. Plants aquatic, submerged in ponds or lakes, or occa- margins, and in mud at 2300 to 3085 m in Duchesne and sionally growing on exposed mud. grasslike; leaves long Summit counties; widely distributed in North America; and slender, from a broadly clasping base; sporangia at circumboreal; 3 (i). base of leaves Isoetaceae, p. 1.3 Isoetes howellii Engelm. Howell Quillwort. Leaves — Plants terrestrial, growing in dry, rocky situations, mostly 15-25 (30) cm long, linear, very slender, firm; leaves small and scalelike; sporangia in terminal strobili hyaline margins extending 1-5 cm above the sporangium; Selaginellaceae, p. 13 velum covering less than 1/2 of the sporangium; megaspores 0.3-0.5 mm wide, with low tubercles, ISOETACEAE Reichenb. ridges, or wrinkles. Pond margin (Dry Lake) at ca 1735 m in Cache County; Washington to Montana, south to Cali- Quillwort Family fornia; 3 (0). Isoetes lacustris L. Lake Quillwort. Leaves linear, Plants perennial, aquatic, amphibious, or sometimes mostly 3-12 cm long, slender, firm; velum covering less terrestrial herbs; stems cormlike, with leaves (mi- than 1/2 of the sporangium; megaspores 0.5-0.8 mm crophylls) clustered in a close spiral at the summit of the wide, with crests or ridges; 2n = 110. Reported for the stem; leaves simple, elongate, dilated basally, the blade Uinta Mts. (Intermountain Flora 1: 184. 1972); widely hollow and transversely septate, the outermost sterile, disjunct in North America; circumboreal; (0). the next innermost bearing megasporangia, and the next innermost bearing microsporangia; sporangia solitary, enclosed in a cavity on the ventral side of the leaf base; SELAGINELLACEAE Reichenb. ligule (a small flap of tissue) borne above the sporangial cavitv; spores dimorphic, of microspores and megaspores; Spikemoss Family X = 21. Plants low, creeping, forming loose mats or dense tufts Isoetes L. among rocks, mosslike in habit and appearance; stems branched, slender, erect or prostrate; leaves (mi- Stems very short; leaves more or less cylindrical, elon- crophylls) numerous, small, oblong to lanceolate, to 3 mm gate, the peripheral tissues often containing longitudinal long, sessile and imbricate, all alike and spirally arranged; strands of sclerenchyma; sporangia borne at the base of heterosporous, the sporophylls green, ovate-triangular, the leaves, usually covered by a velum or thin flap of slightly larger than the vegetative leaves, arranged in 4 tissue. ranks, sharply keeled and forming a 4-angled terminal strobilus often not much different than the vegetative Pfeiffer. N. E. 1922. Monograph of Isoetaceae. Ann. Missouri Bot. Garden 9: 79-232. stem; microsporangia and megasporangia axillary and randomly disposed in the strobilus, orange or yellowish; 1. Megaspores obscurely tuberculate or ridged (as viewed microspores numerous; megaspores 3-4 in each at high magnification) 2 megasporangium, orange; prothalia minute, retained in — Megaspores spinose, crested, or ridged (as viewed at the spore wall; x = 7, 8, 9. high magnification) 3 2(1). Leaves mostly less than 15 cm long; hyaline sporophyll Selaginella Beauv. margins less than 1 cm long above the sporangium; sclerenchymatous strands essentially lacking . / . holanderi Evergreen herbs with dichotomously to monopodially — Leaves mostly more than 15 cm long; hyaline sporophyll branched stems; leaves numerous, imbricate, small; stro- margins mainly 1-5 cm long above the sporangium; bili bisexual, the lower sporophylls usually producing sclerenchymatous strands obvious / . howellii megasporangia and the upper ones microsporangia. 3(1). Megaspores mostly less than 0.5 mm wide, spinose; Flowers. S 1944. Ferns of Utah. Bull Univ. Utah 35(7): 1-87. leaves subulate /. echinospora 1. Plants loosely matted, the branches distant, long and — Megaspores mostly more than 0.5 mm wide, crested or spreading 2 ridged; leaves linear in the lower portion at least / . lacustri.s — Plants denselv tufted or matted, the branches short 3 14 Great Basin Naturalist Memoirs No. 9 margins sparingly ciliate; megaspores ca 0.3 mm thick, 2(1). Stems 2-3 mm thick; leaves gradually tapered to the apex, loosely imbricate, 2.5-3 mm long, the bristle tip somewhat roughened; n = 7, 14, 18, 21. Rocky ledges and 0.3-0.9 mm long S . underwoodii crevices in sagebrush, mountain brush, and ponderosa pine communities, mainly on Navajo Sandstone, at 1650 — Stems ca 1 mm thick; leaves abruptly contracted at the apex, appressed and closely imbricate, 1 mm long, a to 2500 m in Kane and Washington counties; Arizona, bristle tip lacking or minute S . mutica Colorado, Wyoming, New Mexico, and Texas; 4 (0). Selaginella utahensis Flowers Utah Spikemoss. Plants 3(1). Leaves tapering to the apex, the bristle tip long and slender, white, 1-2 mm long; plants of the La Sal and very similar to S . watsonii , but differing in the leaves Uinta mts S . densa which typically have a very short white point to 0. 1 mm long or less, or occasionally with a setum, but this seldom — Leaves abruptly acute, the bristle tip shorter, yellowish green, 0. 1-0.5 mm long or obsolete 4 over 0.2 mm long, or the point obsolete and the leaves wholly muticous. Ledges and crevices in Navajo Sand- 4(3). Terminal setae of leaves evident, mostly 0.2-0.5 mm stone in sagebrush, oakbrush, pinyon-juniper, and pon- long; our most common and most widespread species derosa pine communities at 1060 to 2350 in Kane and S . watsonii m Washington (type from Zion Canyon) counties; Nevada; 4 — Terminal setae of leaves very short (rarely to 0.2 mm long) or obsolete; plants rare in Kane and Washington (i). Selaginella watsonii Underw. Watson Spikemoss. counties S . utahensis Plants in dense tufts or somewhat matted; stems 5-15 cm long, erect to Selaginella densa Rydb. Rydberg Spikemoss. [S . ru- creeping; branches or ascending, 4 cm long 2 thick; leaves crowded, imbricate, dark green, pestris var. densa (Rydb.) Clute; S . scopulorum Maxon]. and mm Plants caespitose, densely tufted, the stems becoming brownish below, oblong-lanceolate, 2-3 mm long, 10-12 cm long, creeping, with numerous short compact 0.5-0.7 mm wide, concave, boat-shaped at back and with and ascending branches; leaves densely imbricate, 2-3 a narrow groove dorsally, the margins sparingly ciliate, mm long, 0.2-0.4 mm wide, pale green, brownish below, the apex with a yellowish green bristle 0.2-0.4 mm long; lanceolate to linear-oblong, tapering toward the apex, strobili erect or diverging from the stem tips, sharply rounded and boat-shaped at back, narrowly grooved dor- 4-angled, to 2.5 cm long (often much shorter); sporo- sally, short-ciliate marginally (often sparingly so), erect, phylls triangular-lanceolate to ovate-lanceolate, sharply 1-2.5 cm long or longer, sharply