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Delosorus

Pteridopsida - Gleicheniales - Matoniaceae

Taxonomy
Delosorus was named by Skog (1988) [comb. nov. Type: Aspidium heterophyllum]. Its type is Delosorus heterophyllus.

It was assigned to Matoniaceae by Skog (1988).

Synonymy list
YearName and author
1988Delosorus Skog

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RankNameAuthor
kingdomPlantae
subkingdomEmbryophyta
phylumPteridophyta
classPteridopsidaRitgen 1828
RankNameAuthor
orderGleicheniales
familyMatoniaceaePresl
genusDelosorus

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
J. E. Skog 1988Fronds bipinnate, possibly tripinnate. Rachis 1-2 mm wide; pinnae linear-lanceolate, becoming somewhat falcate in outline distally and changing from alternate to subopposite, 7-20 cm long, departing from rachis at 40 to 60 degrees. Pinnules falcate, acuminate in sterile forms but obtuse in fertile, alternate, 0.3-0.5 mm apart, 3-7 mm wide, 2-5 m long, margins entire or crenate especially in fertile pinnules, lobes 1-2 mm wide. Lateral veins arising from midrib at 30-40 degrees, usually once dichotomous but in narrower pinnules sometimes not branched, texture apparently somewhat coriaceous. Sori large, 0.5 mm in diameter, round, arranged in 4 or 4 pairs on either side of midvein at end of distal branch of a lateral vein, indusiate, indusium peltate usually segmented into eight wedge-shaped segments. Sporangia arranged in ring around central receptacle, usually ten in a sorus. Annulus oblique, containing about eighteen cells. Spores 30-60 micrometers in diameter, tetrahedral to globose, trilete with an irregular granulate surface, raised laesurae, exospore about 2 micrometers thick, perispore thin, about 0.05 micrometers.