Abstract
The gametophyte of Hygrohypnum bestii is redescribed, and the sex organs and capsule are described for the first time. The species is dioicous and therefore not closely related to the autoicous H. molle which it resembles in some leaf characters. The inner perichaetial bracts differ from those of other American species of the genus in the strong midrib and in the broad bistratose regions of the lamina. Hygrohypnum bestii (Ren. & Bryhn) Holz. has commonly been described as closely related to H. molle (Hedw.) Loeske solely on the basis of vegetative structures because sex organs and capsules of the former species were unknown. Fruiting plants of H. bestii have been found both in Washington and Oregon and the dioicous condition and the structure of the inner perichaetial bracts indicate clearly that it is not a subspecies of H. molle which is autoicous. The gametophyte is variable and the descriptions given by Grout (1931) and previous authors are inadequate. HYGROHYPNUM BESTII (Ren. & Bryhn) Holz., THE BRYOLOGIST 4:12, 22. 1901. (Fig. 1-13). Hypnum (Limnobium) bestii Ren. & Bryhn, Rev. Bryol. 28: 8. 1901. Hygrohypnum molle ssp. bestii (Ren. & Bryhn) Grout, Moss Flora North Amer. 3: 93. 1931. Plants in mats or loose tufts, soft or often stiff and harsh, green to yellow-green or brownish, usually large; stems 3-12 cm long, branching irregularly, rhizoids few; stem without a central strand or with a very faint one, the cortical cells small and thick-walled; leaves erect-spreading to wide-spreading, often slightly contorted when dry, sometimes ?_ secund and slightly asymmetric, broadly ovate to somewhat ovate-lanceolate, tapering from below the middle to the obtusely acute apex, concave, very rarely slightly plicate, decurrent, variable in size but usually longer than broad; stem leaves and large branch leaves 1.4-3.4 X 1.2-2.3 mm, some branch leaves often smaller; margins plane, entire, or minutely serrulate at the apex; midrib strong, usually double, one' or sometimes both branches extending to the middle of the leaf or beyond, sometimes faint in small branch leaves; walls of leaf cells somewhat thickened but not pitted, the median ones long and narrow, 40-125 x 7-10u, apical and basal cells shorter; alar cells sometimes similar to the basal ones, more often differentiated in a small area, quadrate to rectangular, hyaline or yellowish, to 138/ wide. Dioicous, the male and female plants similar; perigonia and perichaetia borne in the axils of leaves olf the stem or the large branches; 1 This study was supported by grant B-15397 from the National Science Foundation to the University of Washington. 2 Department of Botany, University of Washington, Seattle, Washington 98105. This content downloaded from 40.77.167.32 on Sun, 31 Jul 2016 05:13:46 UTC All use subject to http://about.jstor.org/terms 238 THE BRYOLOGIST [Volume 69
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Claims 10
Claim · model-written summary
Hygrohypnum bestii is dioicous.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Outcome
- dioicouse0
Verbatim
t0“Hygrohypnum bestii”
e0“The species is dioicous”
Claim · model-written summary
Hygrohypnum bestii is not closely related to autoicous H. molle despite similar leaf characters.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Outcome
- not closely relatede0
- Comparator
- H. mollee0
Verbatim
t0“Hygrohypnum bestii”
e0“therefore not closely related to the autoicous H. molle which it resembles in some leaf characters”
Claim · model-written summary
The inner perichaetial bracts have a strong midrib and broad bistratose lamina regions relative to other American congeners.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Organ / stage
- inner perichaetial bractse0
- Outcome
- strong midrib and in the broad bistratose regions of the laminae0
- Comparator
- other American species of the genuse0
Verbatim
t0“Hygrohypnum bestii”
e0“The inner perichaetial bracts differ from those of other American species of the genus in the strong midrib and in the broad bistratose regions of the lamina”
Claim · model-written summary
Fruiting Hygrohypnum bestii plants were found in Washington and Oregon.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Outcome
- Fruiting plantse0
- Setting
- Washington and Oregone0
Verbatim
t0“Hygrohypnum bestii”
e0“Fruiting plants of H. bestii have been found both in Washington and Oregon”
Claim · model-written summary
The dioicous condition and perichaetial bract structure indicate H. bestii is not a subspecies of H. molle.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Outcome
- not a subspecies of H. mollee0
- Comparator
- H. mollee0
Verbatim
t0“Hygrohypnum bestii”
e0“the dioicous condition and the structure of the inner perichaetial bracts indicate clearly that it is not a subspecies of H. molle which is autoicous”
Claim · model-written summary
The gametophyte is variable.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Organ / stage
- gametophytee0
- Outcome
- variablee0
Verbatim
t0“Hygrohypnum bestii”
e0“The gametophyte is variable”
Claim · model-written summary
Plants form mats or loose tufts and stems are 3-12 cm long.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Outcome
- stemse0
- Value
- 3-12 cme0
Verbatim
t0“Hygrohypnum bestii”
e0“Plants in mats or loose tufts, soft or often stiff and harsh, green to yellow-green or brownish, usually large; stems 3-12 cm long”
Claim · model-written summary
Stem and large branch leaves measure 1.4-3.4 by 1.2-2.3 mm.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Organ / stage
- stem leaves and large branch leavese0
- Outcome
- stem leaves and large branch leavese0
- Value
- 1.4-3.4 X 1.2-2.3 mme0
Verbatim
t0“Hygrohypnum bestii”
e0“stem leaves and large branch leaves 1.4-3.4 X 1.2-2.3 mm”
Claim · model-written summary
Median leaf cells measure 40-125 by 7-10u.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Outcome
- median onese0
- Value
- 40-125 x 7-10ue0
Verbatim
t0“Hygrohypnum bestii”
e0“the median ones long and narrow, 40-125 x 7-10u”
Claim · model-written summary
Male and female plants are similar, with reproductive structures in leaf axils.
- Taxon
- Hygrohypnum bestiiHygrohypnella bestiit0
- Outcome
- male and female plants similar; perigonia and perichaetia borne in the axils of leaves olf the stem or the large branchese0
Verbatim
t0“Hygrohypnum bestii”
e0“the male and female plants similar; perigonia and perichaetia borne in the axils of leaves olf the stem or the large branches”