Common Name: QUILLWORT FAMILY Habit: Perennial herb, aquatic to terrestrial. Stem: buried, corm-like, 2--3-lobed, corky, brown. Leaf: simple, in grass-like tufts, spirally arranged on stem top, erect to spreading, < 30 cm, linear above base. Sporangia: solitary, embedded in wide leaf base, < 1 cm, +- covered by a translucent membrane, male or female; male spores > 10000, < 0.045 mm, +- bean-shaped, gray or brown in mass; female spores 20--200, 0.2--0.7 mm, spheric, white, +- smooth, ridged, tubercled, or prickly. Genera In Family: 1 genus, 200+ species: worldwide. eFlora Treatment Author: W. Carl Taylor & Jon E. Keeley Scientific Editor: Alan R. Smith, Thomas J. Rosatti.
Etymology: (Greek: evergreen, from habit of some species) Note: Perhaps most poorly known lycophyte genus. Mature female spores, found in decaying leaf bases or soil, critical for identification, as are hand lens for texture when dry, microscope with micrometer for size. Hybrids (spores of variable size, shape) common between aquatic species, making them less distinct.
Isoetes echinospora Durieu
NATIVE Habit: Plant underwater. Leaf: +- evergreen, < 20 cm, soft, flexible, tapered to tip, bright green; base white to +- brown. Sporangia: membrane covering < 50%; male spores 0.02--0.03 mm, gray in mass; female spores 0.4--0.5 mm, prickly. Chromosomes: 2n=22. Ecology: Persistent lakes, pools; Elevation: > 1500 m. Bioregional Distribution: KR, n SNH; Distribution Outside California: to Alaska, eastern North America; Eurasia. Note: Hybridizes with Isoetes bolanderi, Isoetes occidentalis. Spores mature late summer. Synonyms: Isoetes braunii Durieu; Isoetes muricata Durieu Jepson eFlora Author: W. Carl Taylor & Jon E. Keeley Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Isoetes bolanderi Next taxon: Isoetes howellii
Botanical illustration including Isoetes echinospora
Citation for this treatment: W. Carl Taylor & Jon E. Keeley 2012, Isoetes echinospora, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=29379, accessed on April 18, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 18, 2024.
No expert verified images found for Isoetes echinospora.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
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