Abstract
A new thallose hepatic with characters intermediate between those of the Sphaerocarpineae (sensu Müller) and the section Caudiciformes of the Marchantiineae has been discovered on saltpans in north-western Victoria. The female thallus bears a single spherical involucre which has air chambers and specialized pores and contains a single sporophyte. The male plants have not been found. Details are given of the structure and mode of development of the involucre, air chambers, and pores, the early embryogeny of the sporophyte, spore germination, and the development of the thallus. The systematic position of the new plant (Monocarpus sphaerocarpus) is discussed and the literature on the relationship between the Sphaerocarpineae and other thallose hepatics is reviewed. The characters of Monocarpus are shown to support the view that phaerocarpus and allied genera should be placed within the Marchantiales rather than with the Jungermanniales. It is proposed to raise a new suborder of the Marchantiales, Monocarpineae, for the single genus, Monocarpus. Certain problems of morphogenesis are raised and it is suggested that the enciosure of more than one archegonium in an involucre is conducive to the inhibition of development of more than one sporophyte within the involucre. It is also suggested that growth substances released during meiosis in the sporangium control the post-fertilization growth of the thallus and involucre.
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Claims 7
Claim · model-written summary
A new thallose hepatic was discovered in north-western Victoria with intermediate characters.
- Taxon
- Monocarpus sphaerocarpus
Monocarpus sphaerocarpust0 - Outcome
- characters intermediate between those of the Sphaerocarpineae (sensu Müller) and the section Caudiciformes of the Marchantiineaee0
- Setting
- saltpans in north-western Victoriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A new thallose hepatic with characters intermediate between those of the Sphaerocarpineae (sensu Müller) and the section Caudiciformes of the Marchantiineae has been discovered on saltpans in north-western Victoria.”
t0“Monocarpus sphaerocarpus”
Claim · model-written summary
The female thallus has one spherical involucre with air chambers and specialized pores enclosing one sporophyte.
- Taxon
- Monocarpus sphaerocarpusMonocarpus sphaerocarpust0
- Organ / stage
- female thalluse0
- Outcome
- a single spherical involucre which has air chambers and specialized pores and contains a single sporophytee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The female thallus bears a single spherical involucre which has air chambers and specialized pores and contains a single sporophyte.”
t0“Monocarpus sphaerocarpus”
Claim · model-written summary
Male plants were not found.
- Taxon
- Monocarpus sphaerocarpusMonocarpus sphaerocarpust0
- Outcome
- male plants have not been founde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The male plants have not been found.”
t0“Monocarpus sphaerocarpus”
Claim · model-written summary
Characters support placing allied genera within Marchantiales.
- Taxon
- Monocarpus
Monocarpuse0 - Outcome
- placed within the Marchantiales rather than with the Jungermannialese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The characters of Monocarpus are shown to support the view that phaerocarpus and allied genera should be placed within the Marchantiales rather than with the Jungermanniales.”
Claim · model-written summary
The authors propose Monocarpineae as a new suborder for Monocarpus.
- Taxon
- MonocarpusMonocarpuse0
- Outcome
- a new suborder of the Marchantiales, Monocarpineaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is proposed to raise a new suborder of the Marchantiales, Monocarpineae, for the single genus, Monocarpus.”
Claim · model-written summary
Enclosing more than one archegonium may inhibit development of multiple sporophytes.
- Taxon
- Monocarpus sphaerocarpusMonocarpus sphaerocarpust0
- Outcome
- inhibition of development of more than one sporophytee0
- Qualifier
- enciosure of more than one archegonium in an involucree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is suggested that the enciosure of more than one archegonium in an involucre is conducive to the inhibition of development of more than one sporophyte within the involucre.”
t0“Monocarpus sphaerocarpus”
Claim · model-written summary
Growth substances released during sporangial meiosis may control postfertilization thallus and involucre growth.
- Taxon
- Monocarpus sphaerocarpusMonocarpus sphaerocarpust0
- Outcome
- post-fertilization growth of the thallus and involucree0
- Qualifier
- growth substances released during meiosis in the sporangiume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is also suggested that growth substances released during meiosis in the sporangium control the post-fertilization growth of the thallus and involucre.”
t0“Monocarpus sphaerocarpus”