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Published In: Acta Societatis Scientiarum Fennicae 10: 75. 1871. (Acta Soc. Sci. Fenn.) Name publication detail
 

Project Name Data (Last Modified On 2/17/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/17/2011)
Discussion:

Grimmia ovalis is distinguished from all other members of the genus in Central America by its broad, ovate-lanceolate leaves that are bistratose in the upper ½ to 2/3, have plane lower margins, an extensive area of quadrate to oblate basal marginal cells, and a costa that in cross-section is nearly flat on the dorsal surface. The only collection of this species from Central America, the type of G. bernoullii, differs from most other collections of G. ovalis in having a mitrate rather than cucullate calyptra and multiple setae from some perichaetia.

Bartram (1949) reported G. ovalis from Guatemala, but the taxon has been nomenclaturally confused with G. commutata Hüb. and G. affinis (= G. longirostris) see Sayre (1951). Most collections named G. ovalis are instead G. longirostris, while collections named G. commutata are properly referred to G. ovalis. The collections Bartram (1949) reported under G. ovalis are a mixture of G. longirostris, G. elongata and G. ovalis.

Illustrations: Nyholm (1956, Fig. 69 I, as G. commutata); Abramova et al. (1961, Pl. 137 8–14, as G. commutata); Lawton (1971, Pl. 63 1–8); Smith (1978, Fig. 150 5–9); Jóhannsson (1993, Pl. 38); Sharp et al. (1994, Fig. 293); Maier and Geissler (1995, Fig. 20). Figure 99.
Distribution in Central America: GUATEMALA. Quezaltenango: Bernoulli & Cario (PC).
World Range: Subarctic America, Western and Eastern Canada, Northwestern, North-Central, Southwestern, and South-Central U.S.A.; Mexico; Central America; Northern, Southwestern, Middle, Southeastern, and East Europe; Macaronesia, Northern and Southern Africa; Siberia, Russian Far East, Caucasus, Middle Asia, China, Mongolia, Eastern Asia; Indian Subcontinent, Malesia; Australia.

 

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Grimmia ovalis (Hedw.) Lindb., Acta Soc. Sci. Fenn. 10: 75. 1871.

Dicranum ovale Hedw., Sp. Musc. Frond. 140. 1801. Guembelia ovalis (Hedw.) C. Müll., Syn. Musc. Frond. 1: 774. 1849. Protologue: Germany and Austria. In rupestribus montosis Saxoniae, (Thuringiae prope Isenacum, in granite montis piniferi Franconiae, Austriae prope Engelhardszell) (G).

Grimmia bernoullii C. Müll., Bull. Herb. Boissier 5: 200. 1897. Protologue: Guatemala. Quezaltenango; Coll No. 115 partim [Bernoulli & Cario] (PC). 

Plants in dense cushions, brown below, dark-green to blackish above. Stems erect, to 15 mm high, central strand present; rhizoids sparse. Leaves stiffly erect to imbricate when dry, erect‑spreading when wet, 1.8–2.4 mm long, ovate-lanceolate, flat below, concave at apex, acuminate, hair‑points variable in length, spinulose; margins uni- or bistratose, plane below, erect near apex, entire; costa percurrent, flat at back; lamina bistratose in upper 1/2 to 2/3; cells smooth, upper cells 5–7.5 μm long, irregularly rounded to short‑rectangular, incrassate, with straight or sinuose walls, median cells 7–10 μm long, quadrate to rectangular, incrassate with sinuose walls, basal cells near costa 17–47 x 5–7μm, rectangular, incrassate, sinuose, basal marginal cells quadrate to oblate. Dioicous. Setae 1 or 2 per perichaetium, straight, 2 mm long. Capsules exserted, 1.5 mm long, ovoid, erect, smooth; stomata superficial in neck; opercula erect‑rostrate, 1.2 mm long; annuli of 2–3 rows of cells; peristome teeth 16, narrowly triangular, red, densely papillose, irregularly cleft into 2–3 parts and cribrose. Spores 10–12 μm, smooth. Calyptrae yellow, mitrate, 1.5 mm long.

 

 

 
 
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