Gametophytes and Subgeneric Concepts in Lycopodium

Bruce, James G.

doi:10.2307/2441749

Cited by 14 publications

(2 citation statements)

References 2 publications

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“…Sexual and asexual life stages of L. a. are clearly separated: the gametophyte is subterranean and mycoparasitic (see Bruce, 1976) and may take more than 10 years to develop the sporophyte (Bruchmann, 1910;Oinonen, 1968). The sporophyte shows modular growth (Callaghan et al, 1986a, b) which, in the sense of White (1984), is also called metameric growth.…”

Section: Methodsmentioning

confidence: 99%

The extent of clonality in large stands of Lycopodium annotinum L.

Wittig

Jungmann

Ballach

2007

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Methodsmentioning

confidence: 99%

The extent of clonality in large stands of Lycopodium annotinum L.

Wittig

Jungmann

Ballach

2007

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…However, in a recent morphological and anatomical study of material supplied by Freeberg, Bruce (1976) has demonstrated that the sporophytes found on the gametophytes identified as L. cornplanaturn and L. selago were identical with L. cernuum. Bruce (1976) concluded that all materials cultured by Freeberg and Wetmore (1957) were L. cernuurn and rejected the conclusion of Freeberg and Wetmore (1957) that the endophytic fungus was necessary for normal gametophytic development in L. cornplanaturn and L. selago. Given the results of Bruce's study (1976) and the above observations on garnetophytes of L. obscururn in axenic culture, it should be possible to grow normal gametophytes of L. cornplanaturn and L. selago without the endophytic fungus in axenic culture.…”

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confidence: 95%

Gametophytes of Lycopodium obscurum as grown in axenic culture

Whittier¹

1977

Can. J. Bot.

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WHITTIER, D. P. 1977. Garnetophytes oflycoporlir~rlr obscrrrrrrll as grown in axenic culture. Can.J. Bot. 55: 563-567. Garnetophytes of L.vcopodirrm obscrr~.rrtn were grown from spores in axenic culture on a medium containing inorganic nutrients and sucrose. The prothalli developed into thick, diskshaped garnetophytes which bore antheridia. No archegonia were observed on these I-year-old garnetophytes. The morphology of the prothalli in culture was essentially that described for prothalli of L. obsclrrrrrn from nature. However, these Lycopoclirrrrr gametophytes in culture developed without the endophytic fungus which is necessary for the growth of prothalli of L. obscrrrrrtrl in nature. WHITTIER, D. P. 1977. Garnetophytes of Lycopodilrm obscrrnrm as grown in axenic culture. Can.J. Bot. 55: 563-567. Les auteurs ont cultivC les garnetophytes du Lycopodilrm obscrrrrlm a partir de spores en cultures axtniques sur un milieu contenant des elements nutritifs rnintraux et du sucrose. Les prothalles se sont dCveloppCs en garnetophytes Cpais, en forrne de disques et portaient des anthendies. Aprks une annee, aucune archegone ne s'Ctait forrnte sur ces garnetophytes. La morphologie des prothalles cultivks correspond essentiellernent celle dCcrite pour des prothalles de L. obscrlnrm venant de la nature. Cependant, ces garnktophytes de Lycopodium se sont dCveloppes en culture sans le charnpignon endophyte qui est necessaire pour la croissance des prothalles du L. obscrrnrtn en nature.[Traduit par le journal]

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Spermatogenesis in Lycopodium: The Mature Spermatozoid

Robbins

Carothers

1978

American J of Botany

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The mature spermatozoid of Lycopodium cernuum is a blunt ended, fusiform cell, 8–10 μm long by 4–5 μm wide. A multilayered structure (MLS) and a subtending anterior mitochondrion are located at the anterior of the cell. The MLS is coiled through 1–1.5 gyres in a shallow sinistral helix around the periphery of the cell. The MLS would be triangular in outline if unwound and laid flat, about 1.4 μm wide, 7.5–8 μm long, and 80 nm thick. The MLS comprises four layers, S1–S4. The S1 forms the spline, a supportive sheet of microtubules; the S2, lamellate in younger stages, is an homogeneous, darkly staining layer in the mature sperm; the S3 and S4 retain their lamellate appearance and are delimited by lateral connections. Approximately 200 S1 microtubules extend posteriorly from the MLS at about 45° to the MLS long axis and form a partial sheath around the nucleus. The two basal bodies are located on opposite sides of the cell external to the MLS. Each is tangential to the curve of the MLS and surrounded by a globular matrix. At their attachment, the axonemes are oriented laterally and are antiparallel to each other. Distally, the flagella, each about 38 μm long, trail behind the cell as it swims. The nucleus is roughly ovoid, about 4 μm diam, and centrally or sometimes laterally located. The greater volume of the nucleus is occupied by condensed, amorphic chromatin. Cavities within the chromatin are often seen to contain spheroidal inclusions that have two differently staining regions. The inclusions are also located at the periphery of the chromatin. The posterior of the cell is occupied by several small mitochondria and an amyloplast, about 2 μm diam containing numerous starch grains.

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Gametophytes and Subgeneric Concepts in Lycopodium

Cited by 14 publications

References 2 publications

The extent of clonality in large stands of Lycopodium annotinum L.

The extent of clonality in large stands of Lycopodium annotinum L.

Gametophytes of Lycopodium obscurum as grown in axenic culture

Spermatogenesis in Lycopodium: The Mature Spermatozoid

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